[backend] cli script for users creation

[transkarpation]

We need to create a CLI script that will generate users within the context of the current platform and a specific platform application.
CLI script should Register users using randomly generated email and password. The password should be permanent immediately to avoid sending unnecessary emails. The created users should be stored in a CSV/JSON file, which can be downloaded and provided for testing.

[Taras Filatov]

Completed by Borys.