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/search.ex

@@ -0,0 +1,13 @@
+defmodule MobilizonWeb.Resolvers.Search do
+  @moduledoc """
+  Handles the event-related GraphQL calls
+  """
+  alias MobilizonWeb.API.Search
+
+  @doc """
+  Search events and actors by title
+  """
+  def search_events_and_actors(_parent, %{search: search, page: page, limit: limit}, _resolution) do
+    Search.search(search, page, limit)
+  end
+end