Add dynamic raster tiles support

[stepankuzmin]

This PR adds methods for changing a raster tile source dynamically (e.g. setTiles, setUrl). Same as in vector tiles #8048.

Closes #11982

Launch Checklist

• briefly describe the changes in this PR
• write tests for all new functionality
• document any changes to public APIs
• apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'
• add an entry inside this element for inclusion in the mapbox-gl-js changelog: <changelog>add methods for changing a raster tile source dynamically (e.g. setTiles, setUrl).</changelog>

[rreusser]

This looks great! I usually delete layers, then delete sources, switch the url, then re-add everything. This seems like a convenient method, and nothing jumps out as being out of place. The test looks good. Can you confirm you've given it a basic test to ensure it looks visually correct?

[rreusser]

Passing comment, no action needed: Interesting. This is a bit of a strange method. The only usage I see is:

mapbox-gl-js/test/unit/source/vector_tile_source.test.js

Lines 405 to 407 in 3b88dc4

	source.setSourceProperty(() => {
	source.attribution = 'OpenStreetMap';
	});

So I think it's equivalent to:

source.attribution = 'OpenStreetMap';
source.reload()

Maybe it's just a placeholder in case the reload logic gets more complicated. Just jumped out as a bit odd since by the arguments, the method doesn't itself set anything.

[stepankuzmin]

Hi @rreusser 👋

Thanks for the review! Previously I used setSourceProperty in the VectorTileSource's setTiles and setUrl methods, so it's more like a leftover. I've removed it 👍

[rreusser]

Sounds good! At the very least, maybe wrapSourceMutation(() => {...}) would convey the intent more clearly, but removing works as well. 👍