feat: add team members to participants

[ysdanielkim]

TODO:

• ~Parse org name from html_url~ (using the url field to query for teams instead)
• Cache teams

[matthauck]

(not sure if we'd still end up with the blank group name like that issue shows. maybe?)

[ysdanielkim]

Great, yeah I can work on the cache on a separate PR. I took a stab at it yesterday and it wasn't as straightforward as I hoped.