Add ability to filter individual posts (#18945)

* Add database table for status-specific filters

* Add REST endpoints, entities and attributes

* Show status filters in /filters interface

* Perform server-side filtering for individual posts filters

* Fix filtering on context mismatch

* Refactor `toServerSideType` by moving it to its own module

* Move loupe and delete icons to their own module

* Add ability to filter individual posts from WebUI

* Replace keyword list by warnings (expired, context mismatch)

* Refactor server-side filtering code

* Add tests

app/javascript/mastodon/features/ui/util/async-components.js

@@ -161,3 +161,7 @@ export function CompareHistoryModal () {
 export function Explore () {
   return import(/* webpackChunkName: "features/explore" */'../../explore');
 }
+
+export function FilterModal () {
+  return import(/*webpackChunkName: "modals/filter_modal" */'../components/filter_modal');
+}