chore: Remove release please & bump versions

[matheus23]

I want to move away from release-please because:

• It continues trying to release wnfs-bench, even though it shouldn't. (We've tried removing wnfs-bench from all configuration JSONs, but release-please just adds it back, presumably because it reads it from the history somewhere)
• It doesn't handle new crates in the workspace well at all. (Between removing wnfs-namefilter and adding wnfs-nameaccumulator it just got totally confused and we had to manually publish the second release of wnfs-nameaccumulator. This also caused all other crates to not release properly, since they depend on wnfs-nameaccumulator...)
• Now that we've done one manual release, it's gotten completely confused. (See chore: release main #344 and the CHANGELOGs it generated)
• While putting together this PR, I realized that the CHANGELOG formatting got messed up at some point for the wnfs-hamt crate.

So this PR simply removes the workflow.
I also bumped the versions in preparation for a release & added CHANGELOGs.

[appcypher]

More trouble than it is worth. 😮‍💨
So back to manual releases or is there a plan to find a replacement?

[matheus23]

Yep. Back to manual :/