Auto merge of #25789 - szeged:mmatyas__webgl_fns_clearbuffer, r=jdm

Add support for WebGL2 clear buffer operations

Adds support for the following WebGL2 methods:

- `clearBufferfv`
- `clearBufferiv`
- `clearBufferuiv`
- `clearBufferfi`

See: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.11

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cc @jdm @zakorgy

Note: While the code itself doesn't depend on any other PRs, some of the tests do require WebGL2 framebuffer/renderbuffer support (#25785).

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