polyproto federation protocol :polyprototrans: (@polyproto)

mini-update:
Lots of things to do, and lots of things done! In the last days, I have worked a bit on data models for the chat-API, resolved some merge conflicts and cleaned up the polyproto-rs crate for an upcoming release with a much nicer API for developers, and reached out to the Fluxer community after @alexia has already established contact and been doing lots of groundwork in trying to get developers together (thank you very much, Alexia!). I have also been looking at some PRs—some of which I haven't yet managed to review. Please be patient; an exhausted ava will get to them soon!
- @star