Leaflet Heatmap Support

[drdreo]

Is your feature request related to a problem? Please describe.
Leaflet v2 support would be a nice opportunity as well as WebGL rendering

Describe the solution you'd like
Similar to:

• https://ursudio.github.io/leaflet-webgl-heatmap/
• https://www.patrick-wied.at/static/heatmapjs/plugin-leaflet-layer.html
• https://github.com/Leaflet/Leaflet.heat

Once done, we need to create a PR to add it https://github.com/Leaflet/Leaflet/tree/main/docs/_plugins