Enable H/LMS queries in metabase

While the reporting system does make this possible to some extend the scope is very limited. This situation makes writing any kind of exploratory query/dashboard a huge task.

Allow access from LMS to a selection of H's tables.

- [ ] Check if it's possible to point to the read replicas via FDS (instead of the primary). [See this slack thread.](https://hypothes-is.slack.com/archives/CR3E3S7K8/p1712668186257149)
- [ ] Upgrade metabase to the last version. There's a number of improvements that will make dashboards more flexible.
- [ ] Expose "proxy" (ie not the direct table but a view) for at least annotation/group/document.