Geomap panel added to grafana core

[ryantxu]

I just merged: grafana/grafana#36188 in grafana core 🎉

The goal is a solid foundation where we can have multiple custom layers on top of a common base. We would love any feedback on how to make this better and incorporate any of the improvements in this fork.

Apologies that it has taken so long to make any progress here.

See grafana/grafana#36585 for the epic issue

[amotl]

Dear Ryan,

wow, we appreciate your efforts on this. Using OpenLayers instead of Leaflet also came to our mind the other day (#41). We wish you the best of luck pushing this endeavor forward. Please let us know if and how we can support you in any way.

With kind regards,
Andreas.