feat: add permission manager (#1507)

* feat: introduce permission manager

Moved group methods to group package
Moved createTestControllerEnvironment function to jimmtest package

* chore: add juju auth factory

* chore: fixed access tests

* chore: fix relations tests

* chore: refactor grant/revoke offer tests

* chore: change exported surface of jujuauth pkg

* chore: fixes after rebase

* chore: fix list offers test

Listing offers test was failing because model owner was only expected to have consume access on offers but should have admin access.

* chore: add missing docstrings

* chore: add check for missing jimm tag

* chore: update copyright headers

Also updated constructor from NewPermissionManager to NewManager

* chore: minor renaming

---------

Co-authored-by: Ales Stimec <ales.stimec@canonical.com>

cmd/jimmsrv/service/service.go

@@ -254,7 +254,7 @@ func (s *Service) OpenFGACleanup(ctx context.Context, trigger <-chan time.Time)
 	for {
 		select {
 		case <-trigger:
-			err := s.jimm.OpenFGACleanup(ctx)
+			err := s.jimm.PermissionManager().OpenFGACleanup(ctx)
 			if err != nil {
 				zapctx.Error(ctx, "openfga cleanup", zap.Error(err))
 				continue