Optimize tiled feature layer

[claustres]

Notably relevent for large polygon geometries, e.g. countries, if a polygon matches a lot of visible tiles when navigating it will be duplicated for each tile leading to a larger transfered data volume than required and a performance bottleneck.

Possible solutions:

• send IDs of alreay loaded features to avoid duplicating
• debounce requests to only send it when move stops

[cnouguier]

Using PMTiles to render such features could solve the issue