Taxon chooser updates

[kueda]

This is an experiment right now, so please work on this in a branch so we can test before getting this into the production pipeline. Design and text are likely to change, so IMO, not worth spending too much time on UI refinement until we get those firmed up.

Ok, Abhas actually put together some nice designs for a larger set of the changes we've discussed, so I'm updating this issue to reflect that. Note that with these broader changes, it might be helpful to switch to using the taxa/suggest endpoint instead of the computervision endpoints.

Only show Visually Similar & Seen Nearby results in the taxon chooser by default

• [x] Only show the top 10 taxa that have a vision_score and a frequency_score by default. Continue to sort them by their combined_score as we're currently doing
• [x] At the bottom of the list of suggestions, add a button labelled "View suggestions not seen nearby." Tapping that will show only the top 10 taxa that have a vision_score sorted by their vision_score. This will also toggle the button to say "Only view nearby suggestions" and tapping it will return to the prior state
• [x] If there are no taxa that have both a vision_score and a frequency_score, show the taxa with a vision_score sorted by vision_score by default with no button at the bottom of the list

The preference to view include the frequency_score results or not doesn't need to be sticky right now, but might need to be in the future.

Show multiple observation photos, allow viewer to choose the photo being used for suggestions

• [x] Change the current single-photo view to a carousel with dot indicators and swipability
• [x] Changing to a different photo generates new suggestions based on that photo if viewing visually similar results
• [x] Swipable area should not include the up button or the new source button

Allow choice of suggestion sources

• [x] Add a button in the upper right to choose the source
• [x] Tapping the button will bring up a modal allow you to choose between "Visually Similar" and "Research-grade Observations." If using the taxa/suggest endpoint, these correspond to source: visual and source: rg_observations [TODO for @kueda: taxa/suggest may not incorporate the date in the way we probably want to, but we can add an option to do that, like months=7,8,9 or something]
• [x] Toggling the source will fetch new suggestions from that source
• [x] Toggling the source toggles the button icon

Filter suggestions by taxon and place

• [x] Add a filters button to the right of the "Top Suggestions" text
• [x] Tapping it will bring you to a taxon / place chooser like we use on Explore except with a check mark confirmation icon instead of a magnifying glass
• [x] Disable the place option when source is Visually Similar
• [x] These choices will set the taxon_id and place_id in API requests for suggestions
• [x] When set, add a filter bar above the suggestions showing the currently set filters
• [x] When filters are set, the filters button should disappear
• [x] The filter bar should have an X button that lets you clear those filters and restore the filters button

[kueda]

Coming along, but still some changes to make:

• [x] When source is visual, submit the lat and lng params but not the place_lat and place_lng params; when source is rg_observations, submit the place_lat and place_lng params but not the lat and lng params. lat and lng will override their place_* equivalents.
• [x] If the taxon being used to set the taxon_id param has rank_level is <= 10 (species or below), submit its parent's ID instead, e.g. if the filter taxon is a species, submit the ID of the genus that contains it (or whatever its parent is). Generally we want to show people suggestions of related taxa, not the children of the taxon that is already chosen
• [x] Don't submit an image if source is rg_observations
• [x] When source is rg_observations, instead of the "We're not confident" message, say "Most observed options matching filters"
• [x] Replace the pretty_sure_rank translation key with separate keys for all possible ranks, falling back to pretty_sure_rank if none of them exist. English values should have lowercase rank names, e.g. pretty_sure_genus: We're pretty sure it's in this genus
• [x] Replace "Top 10 suggestions" with "Top suggestions"
• [x] Sometimes the photos in the carousel appear as a small square for a bit before the full-sized image loads. What size image are we loading there, and could we get away with loading a smaller size? And/or, could we scale that image up to full the space even if we only have the square URL?
• [x] Tapping the compare button for the nth item in the "only nearby" seems to compare with the the nth taxon in the "not seen nearby" list. It should compare with the taxon you're seeing in the list you're looking at
• [x] Can we cache results least for the duration of being in the taxon chooser? If I view the visual results for one photo, then view them for the next, then return to the first, it feels a bit sill to wait and see exactly the same results. I guess serializing them to disk has its own risks, but maybe worth trying
• [x] Can we bring back the "Visually Similar" and "Seen Nearby" labels from the old taxon chooser?
• [x] Tapping the "x" next to the filter taxon doesn't seem to remove it... which I know will be annoying to get right, but I think we need to not send the taxon_id or place_id (or place_lat or place_lng) if the user has intentionally removed the corresponding filter

[kueda]

• [x] Crashes consistently when viewing observations by other people in Explore
• [x] Only show the Reset button when the filters have changed from the defaults
• [x] Don't initiate a new request when the user swipes to a different photo and the source is rg_observations. Since you're not actually submitting the different photo the results won't change.
• [x] When source is rg_observations the header "Most observed options matching filters" should be "Most-observed options matching filters:"
• [x] In the Suggestions Source modal, the Research Grade Observations description should read "Instead of visually similar suggestions, iNaturalist will suggest species observed in a specific place and within a specific taxonomic group." Currently it's not quite accurate.
• [x] I'm getting an inconsistent crash when viewing suggestions from my own obs in Explore: suggestions-crash.log. When I go back and try again with the same observation I generally can't replicate it. Seems to happen after viewing the taxon chooser a bunch, though, so maybe there's a memory leak to investigate. Weirdly, when I view suggestions for the same obs again, they load, but the obs photo doesn't appear (just a blank white space)

[kueda]

Only one remaining issue I can find, and I don't think it needs to block merging this into the main branch:

• [x] When you open the choose for an obs with a location, the filter automatically gets set to a place using the response from the taxa/suggest endpoint, but if you then edit that filter, the place chooser says "My Location" as the current filter, when it should match what was shown in the filter bar

[kueda]

Some requests from the Forum, from me, and some crashes:

• [x] Filters view should include all the iconic taxa as default taxon options (currently it omits some like Protozoa). I'd also like consistent ordering, preferably: Animalia, Actinopterygii, Aves, Reptilia, Amphibia, Mammalia, Arachnida, Insecta, Plantae, Fungi, Protozoa, Mollusca, Chromista
• [x] Can we expand the tappable area of the back / up arrow? I am repeatedly tapping that and zooming the photo instead
• [x] https://github.com/inaturalist/iNaturalistAndroid/issues/971