Implement search with PostgreSQL trigrams

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

Rename function to reflect that we only get one result

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

Add loggers and make Ecto call parallels during search

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

Implement trigrams for events & replace pg similarity operator % with <%

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

Fix tests

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

lib/mobilizon_web/resolvers/group.ex

@@ -81,7 +81,7 @@ defmodule MobilizonWeb.Resolvers.Group do
           }
         }
       ) do
-    with {:ok, %Actor{} = group} <- Actors.find_group_by_actor_id(group_id),
+    with {:ok, %Actor{} = group} <- Actors.get_group_by_actor_id(group_id),
          {:is_owned, true, _} <- User.owns_actor(user, actor_id),
          {:ok, %Member{} = member} <- Member.get_member(actor_id, group.id),
          {:is_admin, true} <- Member.is_administrator(member),