* Add Create for User + DualWriter setup
* Add delete User
* Fix delete + access check
* Add tests for delete user
* Add tests for create user
* Fixes
* Use sqlx session to fix database locked issues
* wip authz checks
* legacyAccessClient
* Update legacyAccessClient, add tests for create user
* Close rows before running other queries
* Use ExecWithReturningId
* Verify deletion in the tests
* Add Validate and Mutate
* Other changes
* Address feedback
* Update tests
---------
Co-authored-by: Gabriel Mabille <gabriel.mabille@grafana.com>