Use ST_TileEnvelope

[carterthayer]

https://postgis.net/docs/ST_TileEnvelope.html

With ST_TileEnvelope, we could pass in the zoom, tile x, and tile y instead of relying of TMSTileFilter. With that, we can eliminate the djangorestframework-gis dependency.

[carterthayer]

This is only available in postgis 3.0