Use release-plz for automatic releases and semantic versioning

[0xJepsen]

I want to recommend that this repository use release-plz for automatic semantic versioning and releases. When done manually this is error prone and can cause trouble for down stream dependancies. As the rust ethereum ecosystem starts to stabilize i think this is a good idea that preemptively reduces probability of incorrectly incremented semver, and upstream breaking changes. Release please will detect diffs between main and the last release tag, auto detect and increment semantic versioning in a PR and open that PR with a release tag, new semver, and a change log of the commit history. If you like i can open a PR that is an example of configuring this, however, it's important to note that the owner of the project must configure the github secret and if you want to auto publish to crates.io also the api key for crates.