Setup release-plz

[Urhengulas]

release-plz is based on cargo-release and maintains a Release PR, keeping it up-to-date as we merge additional commits. When we're ready to create a release, we simply merge the release PR.

It takes care of:

• CHANGELOG generation (with git-cliff).
• Creation of GitHub releases. --> this will trigger cargo-dist
• Publishing to crates.io.
• Version bumps in Cargo.toml.

Read more https://github.com/MarcoIeni/release-plz.

Todo

• configure secrets.GITHUB_TOKEN permissions to create PRs

• create secrets.CARGO_REGISTRY_TOKEN (expires 07.03.2025, publish-update scope and only for flip-link crate)
  

• configure or disable git-cliff --> do this after this PR, to see how the Release PR looks like