auth: Implement `create_resource` function

* gn3/auth/authentication/checks.py: new `authenticated_p` decorator to apply
  on any function that requires the user to be authenticated before it runs.
* gn3/auth/authorisation/checks.py: use a `auth.authentication.users.User`
  object rather than a UUID object in the global `g`.
* gn3/auth/authorisation/groups.py: Implement the `authenticated_user_group`
  function to get the group(s) in which the currently authenticated user
  belongs.
* gn3/auth/authorisation/resources.py: Implement the `create_resource`
  function correctly.
* tests/unit/auth/conftest.py: extract the User objects into a global variable
  for reusability with the tests.
* tests/unit/auth/test_resources.py: Use global user objects from conftest in
  the tests. Set a User object (rather than UUID) in the global `g` variable.

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