Auto merge of #11724 - emilio:webgl-refactor, r=jdm

webgl: Refactor texture validations to take advantage of rust type system

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This commit introduces the `WebGLValidator` trait, and uses it for multiple
validations in the texture-related WebGL code, to move that logic out of the
already bloated `webglrenderingcontext.rs` file.

It also creates a type-safe wrapper for some WebGL types, removing all the
`unreachable!`s there, and introduces a macro for generating them conveniently.

This partially addresses #10693, pending refactor more code to use this
infrastructure, and (possibly?) introducing an `AsGLError` trait for the errors
to make the error handling happen in `WebGLContext`.

r? @jdm

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tests/wpt/metadata/webgl/conformance-1.0.3/conformance/more/functions/texSubImage2D.html.ini

@@ -1,5 +0,0 @@
-[texSubImage2D.html]
-  type: testharness
-  [WebGL test #0: testTexSubImage2D]
-    expected: FAIL
-