Federated starring is very similar to federated following but requires the database to store remote repos in some way. It uses the ActivityPub `Like` activity and the `liked` collection.

### TODO

In addition to the federated following stuff:

- Handle remote repos in the database
- Create actor endpoint for repos (similar to what we have right now for users)
- Add table for `liked` collection
- API endpoints for returning `liked` collection
- Implement function for fetching `liked` items and returing a collection
- Function for handling `Like` activities for the inbox