## 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-test"
        response = self.client.post(
            f"/api/projects/{self.team.id}/experiments/",
            {
                "name": "Test Experiment",
                "description": "",
                "start_date": "2021-12-01T10:23",
                "end_date": None,
                "feature_flag_key": ff_key,
                "parameters": {
                    "feature_flag_variants": [
                        
                        {"key": "test_0", "name": "Control Group", "rollout_percentage": 33},
                        {"key": "test_1", "name": "Test Variant", "rollout_percentage": 33},
                        {"key": "test_2", "name": "Test Variant", "rollout_percentage": 33},
                    ]
                },
                "filters": {
                    "events": [{"order": 0, "id": "$pageview"}, {"order": 1, "id": "$pageleave"}],
                    "properties": [
                        {"key": "$geoip_country_name", "type": "person", "value": ["france"], "operator": "exact"}
                    ],
                },
            },
        )
        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
        self.assertEqual(response.json()["detail"], "Feature flag variants must contain a control variant")
    def test_deleting_experiment_soft_deletes_feature_flag(self):