MVP no_std for wgpu

[bushrat011899]

Connections

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

Description

• Adds parking_lot and std features to wgpu, allowing for compilation on wasm32v1-none with said features disabled.
• Added an internal Mutex wrapper to handle selecting a non-parking_lot implementation.
• Gated StagingBelt behind std as it requires access to a channel implementation (std::sync::mpsc) to function. This could be replaced with ConcurrentQueue but that will require adding a new dependency to wgpu (although it is already in the lockfile as a dev-dependency)
• Added wgpu to the no_std CI task

Testing

• CI

Squash or Rebase?

Squash

Checklist

• Run cargo fmt.
• Run taplo format.
• Run cargo clippy --tests. 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.

[Wumpf]

lgtm, a few requests regarding documentation