Add PMGSY GeoSadak 2022 (India)

[Vonter]

Layer information from https://github.com/datameet/pmgsy-geosadak

[planemad]

The also includes OSM data and Mapbox Satellite imagery, which overall should be fine for tracing on OSM, but not for other uses. We should correct the license to say ODbL to make this clear.

If the tiles have only the Geosadak data, that would make it a truly CC-by / https://data.gov.in/Godl level tile layer, but we could do that in the future.

Let me also switch the token with one that is specific for OSM India Community use.

[Vonter]

Thanks a lot for the suggestions @planemad, I have included them in the JSON.

[Vonter]

@planemad it looks like the OSM India Community token fails to load the tiles due to an access forbidden 403 error. I have reverted back to the original token for now, but if there's a way to fix the access with the new token, I could try it out.