Let pins federate

- save object ids on pin, instead of activity ids
- pins federation
- removed pinned_activities field from the users table
- activityPub endpoint for user pins
- pulling remote users pins

lib/pleroma/activity.ex

@@ -184,40 +184,48 @@ defmodule Pleroma.Activity do
     |> Repo.one()
   end
 
-  @spec get_by_id(String.t()) :: Activity.t() | nil
-  def get_by_id(id) do
-    case FlakeId.flake_id?(id) do
-      true ->
-        Activity
-        |> where([a], a.id == ^id)
-        |> restrict_deactivated_users()
-        |> Repo.one()
+  @doc """
+  Gets activity by ID, doesn't load activities from deactivated actors by default.
+  """
+  @spec get_by_id(String.t(), keyword()) :: t() | nil
+  def get_by_id(id, opts \\ [filter: [:restrict_deactivated]]), do: get_by_id_with_opts(id, opts)
 
-      _ ->
-        nil
+  @spec get_by_id_with_user_actor(String.t()) :: t() | nil
+  def get_by_id_with_user_actor(id), do: get_by_id_with_opts(id, preload: [:user_actor])
+
+  @spec get_by_id_with_object(String.t()) :: t() | nil
+  def get_by_id_with_object(id), do: get_by_id_with_opts(id, preload: [:object])
+
+  defp get_by_id_with_opts(id, opts) do
+    if FlakeId.flake_id?(id) do
+      query = Queries.by_id(id)
+
+      with_filters_query =
+        if is_list(opts[:filter]) do
+          Enum.reduce(opts[:filter], query, fn
+            {:type, type}, acc -> Queries.by_type(acc, type)
+            :restrict_deactivated, acc -> restrict_deactivated_users(acc)
+            _, acc -> acc
+          end)
+        else
+          query
+        end
+
+      with_preloads_query =
+        if is_list(opts[:preload]) do
+          Enum.reduce(opts[:preload], with_filters_query, fn
+            :user_actor, acc -> with_preloaded_user_actor(acc)
+            :object, acc -> with_preloaded_object(acc)
+            _, acc -> acc
+          end)
+        else
+          with_filters_query
+        end
+
+      Repo.one(with_preloads_query)
     end
   end
 
-  def get_by_id_with_user_actor(id) do
-    case FlakeId.flake_id?(id) do
-      true ->
-        Activity
-        |> where([a], a.id == ^id)
-        |> with_preloaded_user_actor()
-        |> Repo.one()
-
-      _ ->
-        nil
-    end
-  end
-
-  def get_by_id_with_object(id) do
-    Activity
-    |> where(id: ^id)
-    |> with_preloaded_object()
-    |> Repo.one()
-  end
-
   def all_by_ids_with_object(ids) do
     Activity
     |> where([a], a.id in ^ids)
@@ -269,6 +277,11 @@ defmodule Pleroma.Activity do
 
   def get_create_by_object_ap_id_with_object(_), do: nil
 
+  @spec create_by_id_with_object(String.t()) :: t() | nil
+  def create_by_id_with_object(id) do
+    get_by_id_with_opts(id, preload: [:object], filter: [type: "Create"])
+  end
+
   defp get_in_reply_to_activity_from_object(%Object{data: %{"inReplyTo" => ap_id}}) do
     get_create_by_object_ap_id_with_object(ap_id)
   end
@@ -368,12 +381,6 @@ defmodule Pleroma.Activity do
     end
   end
 
-  @spec pinned_by_actor?(Activity.t()) :: boolean()
-  def pinned_by_actor?(%Activity{} = activity) do
-    actor = user_actor(activity)
-    activity.id in actor.pinned_activities
-  end
-
   @spec get_by_object_ap_id_with_object(String.t()) :: t() | nil
   def get_by_object_ap_id_with_object(ap_id) when is_binary(ap_id) do
     ap_id