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

config/routes.rb

@@ -177,7 +177,14 @@ Rails.application.routes.draw do
   resources :tags,   only: [:show]
   resources :emojis, only: [:show]
   resources :invites, only: [:index, :create, :destroy]
-  resources :filters, except: [:show]
+  resources :filters, except: [:show] do
+    resources :statuses, only: [:index], controller: 'filters/statuses' do
+      collection do
+        post :batch
+      end
+    end
+  end
+
   resource :relationships, only: [:show, :update]
   resource :statuses_cleanup, controller: :statuses_cleanup, only: [:show, :update]
 
@@ -448,12 +455,14 @@ Rails.application.routes.draw do
       resources :trends,       only: [:index], controller: 'trends/tags'
       resources :filters,      only: [:index, :create, :show, :update, :destroy] do
         resources :keywords, only: [:index, :create], controller: 'filters/keywords'
+        resources :statuses, only: [:index, :create], controller: 'filters/statuses'
       end
       resources :endorsements, only: [:index]
       resources :markers,      only: [:index, :create]
 
       namespace :filters do
         resources :keywords, only: [:show, :update, :destroy]
+        resources :statuses, only: [:show, :destroy]
       end
 
       namespace :apps do