## Is your feature request related to a problem?

As a team accumulates data, they will have events/properties that are no longer in use that clutter their app.

Example from our team:
![image](https://user-images.githubusercontent.com/148820/143202334-42d73ab6-13be-4661-ba7a-83c86788b9e8.png)


## Describe the solution you'd like

Under event/properties stats allow 'hiding' events/properties from view.

## Describe alternatives you've considered

Alternatively, go the route of "verified" events/properties (as He@p) does - show those first. See also https://help.heap.io/category/heap-administration/data-governance/

## Additional context

Note: Existing reports, etc should still work well even with 'removed' events/properties.

Related: https://github.com/PostHog/posthog/issues/7126

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

posthog/api/test/test_event_definition.py
response = self.client.get("/api/projects/@current/event_definitions/")
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(response.json()["count"], len(self.EXPECTED_EVENT_DEFINITIONS))
        self.assertEqual(len(response.json()["results"]), len(self.EXPECTED_EVENT_DEFINITIONS))
        for item in self.EXPECTED_EVENT_DEFINITIONS:
            response_item: Dict[str, Any] = next(
                (_i for _i in response.json()["results"] if _i["name"] == item["name"]), {}
            )
            self.assertEqual(response_item["volume_30_day"], item["volume_30_day"], item)
            self.assertEqual(response_item["query_usage_30_day"], item["query_usage_30_day"], item)
            self.assertEqual(
                response_item["volume_30_day"], EventDefinition.objects.get(id=response_item["id"]).volume_30_day, item
            )
            self.assertAlmostEqual(
                (dateutil.parser.isoparse(response_item["created_at"]) - timezone.now()).total_seconds(), 0
            )
        
        response = self.client.get("/api/projects/@current/event_definitions/?ordering=volume_30_day")
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(response.json()["results"][0]["volume_30_day"], 1)
    def test_pagination_of_event_definitions(self):