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/actions/statuses.js

@@ -42,9 +42,9 @@ export function fetchStatusRequest(id, skipLoading) {
   };
 };
 
-export function fetchStatus(id) {
+export function fetchStatus(id, forceFetch = false) {
   return (dispatch, getState) => {
-    const skipLoading = getState().getIn(['statuses', id], null) !== null;
+    const skipLoading = !forceFetch && getState().getIn(['statuses', id], null) !== null;
 
     dispatch(fetchContext(id));