deprecate/ split compat/json_style into separate NPM module

[bdon]

• it is difficult to maintain json_style with acceptable parity
• bloats the protomaps.js library in the primary use case where you don't need it
• should only consume the public protomaps.js API

[bdon]

TBH my current plan is to deprecate json_style completely. The maintenance burden is too difficult, and users expect that it will work the same way as mapboxGL/maplibre when this is far from the case (see ol-mapbox-style for example)

Would rather focus efforts on the pure JS api which is more powerful.

[bdon]

This has been removed from main and won't be in release 2.0.