feat: ingest GitHub pull-request and issue pages from URL

[cyclotruc]

This features would mean using the github API
Would you need it?

[waldyrious]

This would be quite helpful to provide context about possible changes to the code base: preferred vs. undesirable approaches, known issues (some of which may be deliberate design choices), nuance regarding otherwise "obvious" fixes, etc.

[github-actions]

Hi there! We haven’t seen activity here for 45 days, so I’m marking this issue as stale.
If you’d like to keep it open, please leave a comment within 10 days. Thanks!