Delete expired access logs

[rgraber]

Checklist

1. If you've added code that should be tested, add tests
2. If you've changed APIs, update (or create!) the documentation
3. Ensure the tests pass
4. Make sure that your code lints and that you've followed our coding style
5. Write a title and, if necessary, a description of your work suitable for publishing in our release notes
6. Mention any related issues in this repository (as #ISSUE) and in other repositories (as kobotoolbox/other#ISSUE)
7. Open an issue in the docs if there are UI/UX changes

Description

Delete access logs older than the configured number of days (defaults to 60). The number of days is configurable in constance.

Notes

Adds a new task to run every day at midnight.

1. Figure out the cut off date based on the configured lifespan of the access logs.
2. Identify all submission logs older than the cut off date and remove them from their submission groups
3. Collect all empty submission groups
4. In batches, submit the empty submission groups for deletion by spawning new batch_delete_audit_logs_by_id tasks
5. Collect all other access logs older than the cut off date
6. In batches, submit these for deletion in the same way

Additional changes:
Add a queryset to the SubmissionAccessLog proxy model to make finding all submission logs easier.
Add the more-itertools library so we can easily break up the list of ids into batches of a constant size. Plain itertools has this functionality in python 3.12, but for the older versions we need the more-itertools library.

The batch size is configurable in settings. It defaults to 1000.

Blocked by #5094
Replaces #5084

[rgraber]

converting to draft until the questions about grouping submissions are resolved