Add support for Sanity v3 (code ready)

[hacknug]

I have a working version of this plugin for Sanity v3. @Grsmto would you be interested in a PR?

It is basically a fork of @sanity/google-maps-input that swaps the Google Maps bits for Mapbox (I believe this is what you did when you created the plugin after looking at the code for guidance).

It still uses the old mapbox-gl@v1 so users from your plugin (like myself) don't need to consider any of the policy or pricing changes that came with v2. In case someone needs this to be updated we could look into it, I guess.

Let me know what you think and if this is something that could be of use to anyone 👍

Btw, your plugin still works fine for me with v0.0.3 so perhaps if v0.0.4 is not working we could also look into what regression was introduced and ship a fix for users with sanity v2?

[Grsmto]

Hi @hacknug

I would happily merge a PR since in its current state it seems like the plugin is not working. I haven't been using Sanity in some time now so I'm a bit lost with the state between v2, v3 etc. (same for Mapbox tbh). So yeah happy to test/merge a PR!

[intelligence]

@hacknug I'm looking to use Mapbox in a project so it would be appreicated if you could supply a working PR :)