Backend API to create Service Account User SAAS

For Service Account Users

&6777

We are already done with Backend Service for creating users

This Issue for creating an API creating users of type Service Accounts. We may need to make changes to POST API call for users to handle user of type Service Accounts

Need to make changes to API call to accept requests from group admins as well.

https://docs.gitlab.com/ee/api/users.html#user-creation

Need to check with security team once regarding implications