implement open graph metadata for apiV4 (#6343)

i18n/en.json

@@ -1699,6 +1699,10 @@
     "id": "api.reaction.init.debug",
     "translation": "Initializing reactions api routes"
   },
+  {
+    "id": "api.opengraph.init.debug",
+    "translation": "Initializing open graph protocol api routes"
+  },
   {
     "id": "api.reaction.list_reactions.mismatched_channel_id.app_error",
     "translation": "Failed to get reactions because channel ID does not match post ID in the URL"