Fix Function Name Conflict in create_user API

The function name create_user in `api/routes` conflicts with the CRUD function create_user from the crud module.
So when we try to create user it is giving error

```
 in create_user
    user = create_user(session=session, user_create=user_in)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: create_user() got an unexpected keyword argument 'user_create'
```