Delete a single record from an existing table

API design:
```
POST /db/table/row-pks/-/delete
Or...
DELETE /db/table/row-pks/-/delete
```
I'm just going to do `POST` for the moment, like I did here:
- #1874

Permission: `delete-row`

Still needed:

- [ ] Tests for rowid tables
- [ ] Tests for compound primary keys