implement ActivityPub for cross instance discussions
Problem to solve
This task comes after implementing ActivityPub support, cross-instance search and cross-instance visualization. For there, we finally have everything we need to implement cross-instance discussions on issues and merge requests.
Proposal
I'd like to avoid designing too precisely just yet as for now I have only theoretical knowledge about ActivityPub : once we're done implementing social features and we have actual real world experience with the standard, we may find it helps with such task as well, or we may be inspired by other implementations solutions.
That being said, ForgeFed already did a lot of designing work around this, we should leverage it.