Remove predicate functions - use `filter_deployments()`

[damianooldoni]

Once #315 is completed, we can replace the predicates with filter functions. Here below the most important steps:

• [x] ~Remove predicate related functions~ UPDATE make predicate functions defunct
• [x] UPDATE: Add item in NEWS.md
• [x] Replace the use of predicate function with filter_deployments()
• [x] Update function documentation
• [ ] Update vignette #320
• [x] Remove tests

[PietrH]

Functions should not do any filtering at all internally, any filtering should happen before and be piped in.

So lines using predicates can just be removed.

[PietrH]

We should make a new vignette about the filtering functions : how to read data, how to manipulate camtrapdp objects

[PietrH]

There are still references to mica in my branch:

https://github.com/inbo/camtraptor/blob/a10adc1adc5ef8d2fc8b40b58894a8225f03de37/R/get_n_species.R#L14

Probably should remove these, I don't want to do this in the same branch

[PietrH]

I should also scan the package of the word filter in the documentation and examples, as well as keep an eye out for triple dots: ...

[damianooldoni]

Based on good practices, we must make these functions defunct, instead of just removing them.