Extract api/v1/statuses#context to standalone controller (#38348)

config/routes/api.rb

@@ -29,6 +29,7 @@ namespace :api, format: false do
         resources :reblogged_by, controller: :reblogged_by_accounts, only: :index
         resources :favourited_by, controller: :favourited_by_accounts, only: :index
         resource :reblog, only: :create
+        resource :context, only: :show
         post :unreblog, to: 'reblogs#destroy'
 
         resources :quotes, only: :index do
@@ -56,10 +57,6 @@ namespace :api, format: false do
 
         post :translate, to: 'translations#create'
       end
-
-      member do
-        get :context
-      end
     end
 
     namespace :timelines do