Refactor Follows/Followers counter syncronization

- Actually sync counters in the database instead of info cache (which got
overriden after user update was finished anyway)
- Add following count field to user info
- Set hide_followers/hide_follows for remote users based on http status
codes for the first collection page

lib/pleroma/object/fetcher.ex

@@ -76,7 +76,7 @@ defmodule Pleroma.Object.Fetcher do
     end
   end
 
-  def fetch_and_contain_remote_object_from_id(id) do
+  def fetch_and_contain_remote_object_from_id(id) when is_binary(id) do
     Logger.info("Fetching object #{id} via AP")
 
     with true <- String.starts_with?(id, "http"),
@@ -96,4 +96,8 @@ defmodule Pleroma.Object.Fetcher do
         {:error, e}
     end
   end
+
+  def fetch_and_contain_remote_object_from_id(_id) do
+    {:error, "id must be a string"}
+  end
 end