setup release-plz and release v0.10.0-alpha.1

[Firestar99]

Caution

Merging this PR will trigger the release!

Warning

Requires #563

• setup release-plz
  • changelogs must be manually written due to our commits not following conventional commits
  • configured to only do things once and not for every crate:
    • only one tag v0.10.0-alpha.1
    • only one changelog in /CHANGELOG.log
  • trusted publishing is set up
    • published a dummy crate to cargo-gpu-install to set that up, since trusted publishing only works on existing crates
• release v0.10.0-alpha.1
  • manually written release, will be published by release-plz once this PR merges (due to branch name matching release-plz*, according to these docs)
  • changelog contents were initially extracted by AI, I cleaned it up a lot and grouped them semantically
  • Do we want a highlights section in the changelog or as a blog post?
• see Setup release-plz spirv-tools-rs#29 as reference

Problem

The release-pr updating the version number updates /Cargo.lock but not /tests/difftests/tests/Cargo.lock, leading to CI failure when merging future releases. Not yet sure how to fix, needs to be fixed so the release PRs of alpha.2 work, so we could go ahead with this release without fixing this.