## 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/property_definition.py
import dataclasses
import json
from typing import Any, Dict, List, Optional, Type
from django.db import connection
from django.db.models import Prefetch
from rest_framework import mixins, permissions, serializers, viewsets
from rest_framework.exceptions import ValidationError
from rest_framework.pagination import LimitOffsetPagination
from posthog.api.documentation import extend_schema
from posthog.api.routing import StructuredViewSetMixin
from posthog.api.tagged_item import TaggedItemSerializerMixin, TaggedItemViewSetMixin
from posthog.constants import GROUP_TYPES_LIMIT, AvailableFeature
from posthog.exceptions import EnterpriseFeatureException
from posthog.filters import TermSearchFilterBackend, term_search_filter_sql
from posthog.models import PropertyDefinition, TaggedItem
from posthog.permissions import OrganizationMemberPermissions, TeamMemberAccessPermission
class PropertyDefinitionQuerySerializer(serializers.Serializer):