feat: Expose onTile callbacks through raster tile layers

[kylebarron]

Add more props to RasterTileLayer (and thus also COGLayer and ZarrLayer)

• onTileLoad
• onTileUnload
• onTileError
• onViewportLoad

Also add props to MosaicLayer:

• onSourceLoad
• onSourceUnload
• onSourceError
• onViewportLoad

In the case of the MosaicLayer, it's just an implementation detail that it's a TileLayer under the hood, so we use the term source consistently.

[kylebarron]

cc @yharby

[yharby]

Thank you @kylebarron