## 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/event_definition.py
event_type = EventDefinitionType(self.request.GET.get("event_type", EventDefinitionType.EVENT))
        search = self.request.GET.get("search", None)
        search_query, search_kwargs = term_search_filter_sql(self.search_fields, search)
        params = {"team_id": self.team_id, "is_posthog_event": "$%", **search_kwargs}
        order, order_direction = self._ordering_params_from_request()
        ingestion_taxonomy_is_available = self.organization.is_feature_available(AvailableFeature.INGESTION_TAXONOMY)
        is_enterprise = EE_AVAILABLE and ingestion_taxonomy_is_available
        event_definition_object_manager: Manager
        if is_enterprise:
            from ee.models.event_definition import EnterpriseEventDefinition
            event_definition_object_manager = EnterpriseEventDefinition.objects.prefetch_related(
                Prefetch(
                    "tagged_items",
                    queryset=TaggedItem.objects.select_related("tag"),
                    to_attr="prefetched_tags",
                )
            )
        else:
            event_definition_object_manager = EventDefinition.objects
        sql = create_event_definitions_sql(
            event_type,
            is_enterprise=is_enterprise,
            conditions=search_query,
            order_expr=order,
            order_direction=order_direction,
        )
        return event_definition_object_manager.raw(sql, params=params)
    def _ordering_params_from_request(