## Is your feature request related to a problem?

I want to run experiments on groups

## Describe the solution you'd like

Experiments support group target metrics, and the FF respects group selection.


## Describe alternatives you've considered

No groups :(

## Additional context



#### *Thank you* for your feature request – we love each and every one!

ee/clickhouse/views/test/test_clickhouse_experiments.py
ff_key = "a-b-tests"
        response = self.client.post(
            f"/api/projects/{self.team.id}/experiments/",
            {
                "name": None,  
                "description": "",
                "start_date": None,
                "end_date": None,
                "feature_flag_key": ff_key,
                "parameters": {},
                "filters": {},  
            },
        )
        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
        self.assertEqual(response.json()["detail"], "This field may not be null.")
        ff_key = "a-b-tests"
        response = self.client.post(
            f"/api/projects/{self.team.id}/experiments/",
            {
                "name": "None",
                "description": "",
                "start_date": None,
                "end_date": None,
                "feature_flag_key": ff_key,