This PR aims to allow clients to use different format for the title and
content of inbox notifications - on the watch endpoint.
This solution will help to have it working and formatted differently on
VSCode, WebUI ...
[Related to this issue](https://github.com/coder/internal/issues/523)
[Resolve this issue](https://github.com/coder/internal/issues/506)
Add a mark-all-as-read endpoint which is marking as read all
notifications that are not read for the authenticated user.
Also adds the DB logic.
This PR is part of the inbox notifications topic, and rely on previous
PRs merged - it adds :
- Endpoints to :
- WS : watch new inbox notifications
- REST : list inbox notifications
- REST : update the read status of a notification
Also, this PR acts as a follow-up PR from previous work and :
- fix DB query issues
- fix DBMem logic to match DB
