Automate release creation with release-plz

[Miaxos]

Is your feature request related to a problem? Please describe.

I would love to have an automated process creation for monoio, it would properly sync between GH releases and crates.io releases which are not synced right now, GH indicate 0.2.0 & Crates.io 0.2.1.

And we also wouldn't need to ask someone to release the project.

Describe the solution you'd like

Integrate release-plz from https://release-plz.ieni.dev/ which would create a Pull Request for release and update it as more works are pushed in.

Describe alternatives you've considered

We could do it with another flow, but this one is pretty simple and efficient.

Additional context
Add any other context or screenshots about the feature request here.