## 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
f"/api/projects/{self.team.id}/experiments/{id}",
            {
                "description": "Bazinga",
                "filters": {
                    "events": [{"order": 0, "id": "$pageview"}, {"order": 1, "id": "$pageleave"}],
                    "properties": [
                        {"key": "$geoip_country_name", "type": "person", "value": ["france"], "operator": "exact"}
                    ],
                },
            },
        )
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        created_ff = FeatureFlag.objects.get(key=ff_key)
        self.assertEqual(created_ff.key, ff_key)
        self.assertFalse(created_ff.active)  
        self.assertEqual(created_ff.filters["multivariate"]["variants"][0]["key"], "control")
        self.assertEqual(created_ff.filters["multivariate"]["variants"][1]["key"], "test")
        self.assertEqual(created_ff.filters["groups"][0]["properties"][0]["key"], "$geoip_country_name")
        
        response = self.client.patch(
            f"/api/projects/{self.team.id}/experiments/{id}", {"start_date": "2021-12-01T10:23",},
        )
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        created_ff = FeatureFlag.objects.get(key=ff_key)
        self.assertEqual(created_ff.key, ff_key)
        self.assertTrue(created_ff.active)
        self.assertEqual(created_ff.filters["multivariate"]["variants"][0]["key"], "control")
        self.assertEqual(created_ff.filters["multivariate"]["variants"][1]["key"], "test")
        self.assertEqual(created_ff.filters["groups"][0]["properties"][0]["key"], "$geoip_country_name")
    def test_launching_draft_experiment_activates_FF(self):