feat: starboard

[notscrappie]

Starboard

Would be a nice to have for servers that pin a lot of stuff. Includes a feature toggle on the dashboard + channel selection form.

To-Do

• [x] Make a feature schema and implement it.
• [x] Add the feature toggle & channel selection functionality to the dashboard.
• [x] Add basic starboard features (sending messages upon starring)
• [x] Add forcing messages to the starboard (/starboard force).
• [x] Add freezing and unfreezing the star count of the message (/starboard freeze & /starboard unfreeze).