ci: rewrite

[loichyan]

The GitHub workflow has been completely rewritten, the detailed changes are as follows:

1. Deprecates our own Cargo cache implementation in favor of Swatinem/rust-cache.
2. Adds formatting, Clippy, RustSec Advisory, MSRV, and nightly toolchain checks.
3. Reports check results as GitHub annotations.
4. Adds more release targets, now including:
   • aarch64-apple-darwin
   • aarch64-pc-windows-msvc
   • aarch64-unknown-linux-musl
   • x86_64-apple-darwin
   • x86_64-pc-windows-msvc
   • x86_64-unknown-freebsd
   • x86_64-unknown-linux-musl
5. Automates the release workflow:
   1. Create a release branch, e.g. release/v1.0.0.
   2. Bump versions and update changelogs.
   3. Open a PR release/v1.0.0 -> main with the changelog as the body.
   4. Wait for the builds to finish.
   5. The GitHub action creates a draft GitHub release with v1.0.0 as the tag and the PR body as the notes and uploads all artifacts.
   6. Merge the PR.
   7. (Optional) Create a signed tag v1.0.0, or let GitHub do it automatically.
   8. Publish the GitHub release.