Mastodon API: Support push subscription CRUD

priv/repo/migrations/20180918182427_create_push_subscriptions.exs

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+defmodule Pleroma.Repo.Migrations.CreatePushSubscriptions do
+  use Ecto.Migration
+
+  def change do
+    create table("push_subscriptions") do
+      add :user_id, references("users", on_delete: :delete_all)
+      add :token_id, references("oauth_tokens", on_delete: :delete_all)
+      add :endpoint, :string
+      add :key_p256dh, :string
+      add :key_auth, :string
+      add :data, :map
+
+      timestamps()
+    end
+
+    create index("push_subscriptions", [:user_id, :token_id], unique: true)
+  end
+end