Ray Query support

[kvark]

Path support:

• WGSL-in
• validation
• SPV-out
• MSL-out
• HLSL-out (not planned for this PR)

Note: PR also adds basic infra for specially generated types in IR, which may be handy for #1161

[codecov-commenter]

Codecov Report

Merging #2256 (85383aa) into master (0b87d19) will increase coverage by 0.22%.
The diff coverage is 91.54%.

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@@            Coverage Diff             @@
##           master    #2256      +/-   ##
==========================================
+ Coverage   81.96%   82.18%   +0.22%     
==========================================
  Files          80       82       +2     
  Lines       43312    44261     +949     
==========================================
+ Hits        35502    36378     +876     
- Misses       7810     7883      +73     

Impacted Files	Coverage Δ
src/back/dot/mod.rs	44.15% <0.00%> (-2.02%)	⬇️
src/back/glsl/mod.rs	85.85% <0.00%> (-0.08%)	⬇️
src/back/hlsl/writer.rs	91.06% <0.00%> (-0.06%)	⬇️
src/back/mod.rs	96.96% <0.00%> (-0.99%)	⬇️
src/back/wgsl/writer.rs	91.65% <0.00%> (-0.10%)	⬇️
src/front/glsl/constants.rs	70.22% <0.00%> (-0.11%)	⬇️
src/front/mod.rs	87.69% <ø> (ø)
src/front/wgsl/error.rs	64.50% <0.00%> (-0.69%)	⬇️
src/front/wgsl/mod.rs	73.38% <0.00%> (-0.60%)	⬇️
src/front/wgsl/parse/ast.rs	22.85% <ø> (ø)
... and 25 more

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[jimblandy]

This is interesting. I don't fully understand the ray tracing API, but I've tried to follow what's going on as best I could. Just a few points to address.

[jimblandy]

@kvark By the way, I went ahead and pushed a commit that expands on the documentation, so be sure to pull before working on the branch. If the docs aren't accurate, feel free to just take the commit out.

[kvark]

@jimblandy thanks for the review! Everything should be addressed now.
I'd also like to hear your thoughts on naming, i.e. ray_desc vs RayDesc.

[jimblandy]

Looks good to me. Give my RayDesc fix a look, and then feel free to merge if it seems okay.

[kvark]

Much nicer than my version, thank you!