Add first stage for forum channels

[MinnDevelopment]

Pull Request Etiquette

• [x] I have checked the PRs for upcoming features/bug fixes.
• [x] I have read the contributing guidelines.

Changes

• [x] Internal code
• [x] Library interface (affecting end-user code)
• [ ] Documentation
• [ ] Other: _____

Closes Issue: NaN

Description

This attempts to implement the current feature space for forums.

TODO

• [ ] Permission checks
• [ ] Documentation
• [x] Manager implementation