[web] ☂️ Implement skwasm renderer

[eyebrowsoffire]

This tracks fully implementing the Renderer API using the skwasm wasm module.

[eyebrowsoffire]

I'm going to treat this as an umbrella for the remaining pieces to get this feature parity with CanvasKit:
#126339
#126340
#126341
#126342
#126345

[eyebrowsoffire]

Done with flutter/engine#43011

[github-actions]

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