Create an organization activity report in a single region

We should create a report which shows various details about organizations and allows you to sort by a number of different conditions. This will prove many of the core data competencies we will need.

This report can start life as a table with the following columns:

* Organization public id
* Name
* Date / semester
* Active teachers
* Active user
* Total annotations

We should be able to group this table by:

* Semester
* **_Bonus points!_** - If we can do it by more than one thing in a configurable way, that's cool

We should be able to filter by:

* Organization public id

Other interactivity:

* **_Bonus points!_** - If you can "click-through" to more details, that's nice, but not required for this project
* With this in mind we may want to investigate what Metabase models can and can't do for us

### Definition of "active"

In the [project document](https://www.notion.so/Business-intel-MVP-ab8eb66d1f5945a6a66d92108f491e1a) active is defined as:

> ACTIVE IS SEEN AS LOGGING IN

However in different discussions there has been a desire to have historical data which would rule this definition out. The existing definition of active is:

* A user is active, if they are in a group which has at least one annotation in the given period

One posibility for sliding from one situation to the other is to attempt to count a user as active if:

* They have logged in in the period in question
* _or_ they are in a group with one annotation in the period

### Questions we can answer with this report

If we have this report, we will have proven the capability to answer the following questions in region:

* (1) Active teachers per semester - (apply filter to single organization id, set time period to semester)
* (2) Active users per semester - (apply filter to single organization id, set time period to semester)
* (3) Active institutions per semester - (set time period to semester, sort by active users desc)
* (4) Top annotating institutions - (set time period to semester, sort by annotations desc)

Once this data is aggregated to a higher level we should be able to answer (3) and (4) in a global context, but that is for:

* https://github.com/hypothesis/lms/issues/4517

### Implementation notes

* As this requires annotation counts we will almost certainly need roll up tables of annotation counts by group by time-period
* Our events table isn't very fast either and could do with a roll up - This might be a good place to start as it's simpler

## Tasks

* [ ] Decide on naming scheme and general Metabase configuration
* [ ] Create the correct Metabase instance to host the regional report for the US
* [ ] Create required aggregates and views
* [ ] Create a method to keep the aggregates and views up to date
* [ ] Create the report in this Metabase