Automate releases of crates to crates.io

We should integrate with something like [release-plz](https://github.com/MarcoIeni/release-plz) or [cargo-smart-release](https://github.com/Byron/cargo-smart-release) to automate the process of publishing crates, updating the changelog, etc.

Compare release-plz and cargo-smart-release against the repository's current release process, focusing on crate publishing and changelog updates. Done means a documented automation path is selected and releases can publish the crates and update the changelog without the current manual process.

Written by the indexing model from the issue text.