[vulkan] Automatically add linux buffer sharing extensions if available.

[Vecvec]

Connections

Description
Automatically adds the Linux buffer sharing extensions to the enabled extensions list if they are available.

Testing
None in wgpu, externally used (though I've tested my use of it and it works).

Squash or Rebase?
Squash

Checklist

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