## 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_property_definition.py
org = Organization.objects.create(name="Separate Org")
        team = Team.objects.create(organization=org, name="Default Project")
        team.event_properties = self.team.event_properties + [f"should_be_invisible_{i}" for i in range(0, 5)]
        team.save()
        response = self.client.get(f"/api/projects/{self.team.pk}/property_definitions/")
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        for item in response.json()["results"]:
            self.assertNotIn("should_be_invisible", item["name"])
        
        response = self.client.get(f"/api/projects/{team.pk}/property_definitions/")
        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
        self.assertEqual(response.json(), self.permission_denied_response())
    def test_query_property_definitions(self):