Expose more statistics

* differenciate local & all events/comments/groups
* add instance follows/followings

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon/actors/actors.ex

@@ -1076,6 +1076,17 @@ defmodule Mobilizon.Actors do
     |> Page.build_page(page, limit)
   end
 
+  @doc """
+  Returns the number of followers for an actor
+  """
+  @spec count_followers_for_actor(Actor.t()) :: integer()
+  def count_followers_for_actor(%Actor{id: actor_id}) do
+    actor_id
+    |> follower_for_actor_query()
+    |> where(approved: true)
+    |> Repo.aggregate(:count)
+  end
+
   @doc """
   Returns the list of followings for an actor.
   If actor A follows actor B and C, actor A's followings are B and C.
@@ -1087,6 +1098,17 @@ defmodule Mobilizon.Actors do
     |> Repo.all()
   end
 
+  @doc """
+  Returns the number of followings for an actor
+  """
+  @spec count_followings_for_actor(Actor.t()) :: integer()
+  def count_followings_for_actor(%Actor{id: actor_id}) do
+    actor_id
+    |> followings_for_actor_query()
+    |> where(approved: true)
+    |> Repo.aggregate(:count)
+  end
+
   @doc """
   Returns the list of external followings for an actor.
   """