Add override for `select_taxa` so user can manually specify whether names or identifiers have been provided

[mjwestgate]

Not sure what approach you’re taking here, but there might be an argument for splitting this into two different functions:

• search_taxa() for searching for strings (consistent with search_fields())
• select_taxa() for supplying a uid

Just an idea though.

[matildastevenson]

I think this could work- some additional thoughts:

• search_taxa() would take two of the additional arguments currently taken by select_taxa- children, and all_ranks
• The counts argument in select_taxa would be removed, and users encouraged to use ala_counts(group_by = 'speciesID') to get the same information
• select_taxa would accept ids or strings- and would assume that a user had checked that the string was what they wanted
• select_taxa would have to accept ids generated by taxize
• select_taxa could just have ... as the argument- this would make it nicely consistent with the other select_ functions
• Functionality in search_taxa could be duplicated in taxize (and potentially eventually replaced)- making it possibly worth importing taxize into the package
• ala_species will stay as is, because it enables listing species by area/matching filters etc.- and the other taxa functions don't do this. To avoid confusion, I think it is good to keep it as ala_species as opposed to ala_taxa. If users want information for other ranks it is just a subset of what is returned by ala_species. It would be good for ala_species to return intermediate rank information, but I think this change should be made on the ALA side rather than in galah.