Introduce application tokens

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

priv/repo/migrations/20230215125801_create_application_tokens.exs

@@ -0,0 +1,14 @@
+defmodule Mobilizon.Repo.Migrations.CreateApplicationTokens do
+  use Ecto.Migration
+
+  def change do
+    create table(:application_tokens) do
+      add(:user_id, references(:users, on_delete: :delete_all), null: false)
+      add(:application_id, references(:applications, on_delete: :delete_all), null: false)
+      add(:authorization_code, :string, null: true)
+      timestamps()
+    end
+
+    create(unique_index(:application_tokens, [:user_id, :application_id]))
+  end
+end