allow gles float textures to be multisampled if available

[Wumpf]

Checklist

• Run cargo clippy.
• Run RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknown if applicable.
• Add change to CHANGELOG.md. See simple instructions inside file.

Connections
n/a

Description
Couldn't find any restrictions on render target use for enabled float textures on GLES. It seems MSAA use works just fine iff the respective float extensions are enabled.

Testing
Tested rendering to a RGBA32f and RGBA16f target on WebGl. Did not check on resolve

[codecov-commenter]

Codecov Report

Merging #3183 (7de72e3) into master (04d12ba) will decrease coverage by 0.07%.
The diff coverage is 62.22%.

@@            Coverage Diff             @@
##           master    #3183      +/-   ##
==========================================
- Coverage   64.70%   64.62%   -0.08%     
==========================================
  Files          81       81              
  Lines       38819    39485     +666     
==========================================
+ Hits        25118    25518     +400     
- Misses      13701    13967     +266     

Impacted Files	Coverage Δ
player/src/lib.rs	53.31% <ø> (ø)
wgpu-core/src/id.rs	81.25% <0.00%> (-2.63%)	⬇️
wgpu-core/src/lib.rs	96.55% <ø> (ø)
wgpu-core/src/present.rs	0.00% <0.00%> (ø)
wgpu-core/src/resource.rs	25.13% <ø> (ø)
wgpu-hal/src/dx11/device.rs	0.00% <0.00%> (ø)
wgpu-hal/src/empty.rs	0.00% <ø> (ø)
wgpu-hal/src/lib.rs	26.21% <ø> (ø)
wgpu/src/backend/direct.rs	54.80% <0.00%> (-0.30%)	⬇️
wgpu/src/lib.rs	50.33% <0.00%> (-2.49%)	⬇️
... and 43 more

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[Wumpf]

@cwfitzgerald bump :)

[cwfitzgerald]

Party