make Ids a u64 internally

[i509VCB]

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
#3051

Description
This is going to be needed for future dynamic dispatch work, feature dependent types need to go for this to happen.

cc @TheOnlyMrCat

[codecov-commenter]

Codecov Report

Merging #3178 (d8a8713) into master (6ed103e) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

❗ Current head d8a8713 differs from pull request most recent head 7e82824. Consider uploading reports for the commit 7e82824 to get more accurate results

@@            Coverage Diff             @@
##           master    #3178      +/-   ##
==========================================
- Coverage   64.73%   64.65%   -0.09%     
==========================================
  Files          81       81              
  Lines       38747    38799      +52     
==========================================
+ Hits        25084    25085       +1     
- Misses      13663    13714      +51     

Impacted Files	Coverage Δ
wgpu-core/src/id.rs	81.25% <0.00%> (-2.63%)	⬇️
wgpu/src/backend/direct.rs	55.25% <0.00%> (ø)
wgpu/src/lib.rs	50.89% <ø> (-1.93%)	⬇️
wgpu-hal/src/dx12/descriptor.rs	88.05% <0.00%> (+0.49%)	⬆️

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[cwfitzgerald]

Very chilly beans