Auto merge of #24178 - mmatyas:webgl_fns_query, r=jdm

Initial implementation of WebGLQueries

This patch adds initial support for WeGLQueries. Most related WebGL functions and objects ([1]) are implemented; what's still missing is:

- syncing the result of `getQueryParameter` with the event loop
- `EXT_disjoint_timer_query_webgl2` support

[1]: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.12

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cc @jdm @zakorgy

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