Use core and alloc instead of std in naga

[bushrat011899]

Connections

• Supersedes no_std for naga #7249
• Contributes to Support no_std where possible (specifically for wasm32v1-none) #6826

Description

• Reduce friction in future no_std development

Solution

• Added the following warning level lints to naga:
  • std_instead_of_alloc
  • std_instead_of_core
  • alloc_instead_of_core
• Added #![no_std] to change the implicit prelude from std to core
• Added extern crate alloc and extern crate std
• Fixed use statements across naga

Testing

cargo clippy -p naga --all-features --all-targets

Squash or Rebase?

Squash.

Checklist

• Run cargo fmt.
• Run taplo format.
• Run cargo clippy. If applicable, add:
  • --target wasm32-unknown-unknown
• Run cargo xtask test to run tests.
• If this contains user-facing changes, add a CHANGELOG.md entry.

[cwfitzgerald]

I know this is a PR which will bitrot exceptionally fast, going to make sure all is clear tomorrow with the rest of the team, then merge.

[cwfitzgerald]

Nice, thank you!