kobotoolbox / kpi / 18562672376

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feat(userReports): add `/api/v2/user-reports/` endpoint for superusers DEV-232 DEV-899 (#6243)

### đŸ“Ŗ Summary
Add a new superuser-only endpoint, `/api/v2/user-reports/`, to access
and filter all user usage data.

### 💭 Notes
- Created a new Django app `user_reports` 
- Used a SQL materialized view along with some Django tables to gather
and calculate all the data for the endpoint
- Our celery task `refresh_user_report_snapshots` runs every 30 minutes
and works to update the data in batches
- The endpoint is only accessible if Stripe is enabled 
- Renamed api tag "Audit logs (superusers)" to "Server logs
(superusers)" ([Zulip
thread](https://chat.kobotoolbox.org/#narrow/stream/4-Kobo-Dev/topic/API.20Documentation/near/713167))


### 📖 Description

This PR introduces a new endpoint `/api/v2/user-reports` that provides
detailed information about users, including their personal details,
metadata, organization info, subscriptions, usage statistics, and
computed balances. It supports flexible nested filtering, allowing
queries like:
```
/api/v2/user-reports/?q=username__icontains:demo
/api/v2/user-reports/?q=service_usage__total_storage_bytes__gte:1
/api/v2/user-reports/?q=service_usage__balances__submission__balance_value__gte:5000
```
To handle a large user base, the endpoint leverages a PostgreSQL
materialized view that aggregates user-related data for fast retrieval.
Since some data (like usage and submissions) lives in another database,
a periodic Celery task `refresh_user_report_snapshots` was added to
pre-compute and store this data in a new `BillingAndUsageSnapshot`
table. The materialized view references this snapshot for further
computations. A `BillingAndUsageSnapshotRun` table was also added to
track each run and safely resume interrupted jobs.


### 👀 Preview steps

1. ℹī¸ have a superuser account and multiple regular users in multiple
organizations
2. create projects, make submissions, and buy stripe subscriptions
3. checkout this branch and ru... (continued)

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