Type 'WebGLTileLayer' is not generic.

[bcherkezovtf]

Describe the bug
I'm using OL with TypeScript and until v9 I was using TileLayer from ol/layer/Tile and after release of this version I tried the WebGLTile layer.
With the TileLayer you need to specified the source type (Generic type 'TileLayer<TileSourceType>' requires 1 type argument(s).ts(2314)), but with the WebGL TileLayer this throws an error.
Is there a problem the WebGL Options type to be defined as Options<SourceType extends DataTile | TileImage>?

[bcherkezovtf]

If it's ok to work with generic for type of the source, I can make a PR.