Add public crate publishing to our CI pipeline

[t00ts]

We now have a few public crates that need to be published, as a result of the recently introduced pathfinder-class-hash.

Our current build process is done in two steps:

1. Tag creation, with draft release and binary building
2. Manual release

We should add:

1. A dry run (e.g. cargo publish --dry-run)
2. The actual publishing to crates.io

Furthermore, we'll also need to explore how to run a project-wide version bump, potentially leveraging just, in a way where Cargo.lock is properly updated after all the affected crates have been adjusted.