Allow users to retrieve taxon names

[kueda]

Not sure whether this needs to be under /taxon_names or nested within /taxa/:id, but this would

1. Allow us to stop using the Rails endpoint on the web for taxon detail
2. Help data partners resolve synonymy issues with iNat's taxonomy (e.g. taxa is Xxx yyy on Calflora, but Zzz yyy on iNat)

FWIW, I just learned we have this all_names param for /v1/taxa, e.g. https://api.inaturalist.org/v1/taxa?q=Acacia%20baileyana&all_names=true, which definitely helps with the partner synonymy issue, but that's still not quite the same as showing the taxon names, as it conflates locale and lexicon. Using that on the taxon detail page, for example, would require mapping those "locale" values to actual lexicons.

[jotamayo97]

I'm trying to fully understand the task. Would this mean transferring this web endpoint: https://www.inaturalist.org/taxon_names.json?per_page=400&taxon_id=894183 to the API?
Any changes in it that I should take into account? Any details are welcome, thanks! :)