Plugin DM interface

[Keyrxng]

Related to ubiquity-os/ubiquity-os-logger#49

• Build an endpoint which allows any plugin to call this worker and have it send a DM to the users passed in
• Allows us to get real-time logs and removes the issue with logs being restricted behind Cloudflare
• The plugin dev gets all logs not just the comment posted error (not all are posted)

E.g the logger will DM errors to the GitHub usernames that the plugin dev inits the logger with
E.g the endpoint will simply accept something like username: msg and deliver it

1. Stopping spamming; Confirm the request comes from a ubiquity worker domain? Use header auth? Use kernel auth? unsure needs more thought
2. ...