Add REST API for featuring and unfeaturing a hashtag (#34489)

Co-authored-by: Matt Jankowski <matt@jankowski.online>
Co-authored-by: Claire <claire.github-309c@sitedethib.com>

config/routes/api.rb

@@ -216,6 +216,8 @@ namespace :api, format: false do
       member do
         post :follow
         post :unfollow
+        post :feature
+        post :unfeature
       end
     end