kobotoolbox / kpi / 12810244921

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feat(projectHistoryLogs): log new submissions (#5416)

### 📣 Summary
Create logs when new submissions are added to projects.


### 👷 Description for instance maintainers
Allow null user_uids in AuditLogs so we can log anonymous submissions.


### 💭 Notes
We previously had no need for null users in audit logs because the
actions we logged were all restricted to authenticated users, but since
we allow anonymous submissions, we needed a way to log those.



### 👀 Preview steps

Feature/no-change template:
1. ℹ️ have an account and a project. Make sure the account username is
not `admin` (see [this notion
task](https://www.notion.so/kobotoolbox/Anonymous-submissions-dont-work-if-user-named-admin-owns-asset-1767e515f65480608dfcee76ba9b3710?pvs=4))
2. Deploy the project
3. Add a submission to the project
4. Go to `api/v2/asset/<asset-uid>/history`
5. 🟢 There should be a new project history log with
`action='add-submission'` and all the usual metadata, plus
```
"submission": {
    "submitted_by": "user1"
}
```
6. Enable submissions without username/email to the project
7. To make sure you're submitting anonymously, copy and paste the enketo
link into a new private tab and add a new submission
8. 🟢 Reload the endpoint. There should be a new audit log with
`action='add-submission'`
a. The user should be
`http://kf.kobo.local:8080/api/v2/users/AnonymousUser/`
  b. The user_uid will be the uid of the anonymous user in the database
  c. The username should be `AnonymousUser`
d. The metadata should contain `{"submission": {"submitted_by":
"AnonymousUser"}` in addition to the usual

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