mgr/progress: expose API from CLI

mgr/progress: expose API from CLI

Fixes: https://tracker.ceph.com/issues/72893
Through cli-api mgr module, users can invoke ceph-mgr Python API from
the CLI. The progress module API was partially exposed. This change
allows them to create progress event from the CLI.

Example:
```bash
ceph mgr module enable cli_api
ceph mgr cli update_progress_event evid_18 "Upgrading foo..." 0.1 --add-to-ceph-s

{
  "evid_18": {
    "message": "Upgrading foo...",
    "progress": 0.10000000149011612,
    "add_to_ceph_s": true
  }
}
```

Signed-off-by: Ernesto Puerta <epuertat@redhat.com>