Add publish/bump scripts

[mmastrac]

New version bump and publish scripts.

The workflow is pretty simple:

just publish

... will run the publication process, comparing each crate against the latest published version.

Nothing stops us from running the older-style publication process and both of them can coexist. I suspect there might be a weird corner case where the test cargo publish is unable to generate a package because there's a missing upstream dependency, but I wasn't able to reproduce it.

This worked to republish all of the crates in two smaller batches, but I'll keep refining it as we go.

[aljazerzen]

What's the problem that these scripts solve? Easier publication compared to tagging and pushing to gh?

It is an improvement in that regard.

I am a bit skeptical about it being written in bash, otherwise looks good.

[mmastrac]

The current process is error-prone, it's non-trivial to publish n > 1 packages and it is very difficult to know when packages are actually out of date. I've been burned by this a few times lately.

As we break up and publish more and more crates, this is only going to get more and more painful without tooling.

I am not usually a fan of bash for complex scripts, but this is pretty simple and is mostly coordination of other processes. I believe the majority (or close to) of the lines are just "echo".