[Enhancement] Custom media lifecycle scripts (#219)

* Namespaced notification modules under lifecycle

* Added a JSON encoder for all the main model types

* Added startup task to create user script file

* Hook up user script event to media download

* Hooked up media deletion user script

* Added jq to docker deps

* Updated README

lib/pinchflat/slow_indexing/media_collection_indexing_worker.ex

@@ -15,7 +15,7 @@ defmodule Pinchflat.SlowIndexing.MediaCollectionIndexingWorker do
   alias Pinchflat.Sources.Source
   alias Pinchflat.FastIndexing.FastIndexingWorker
   alias Pinchflat.SlowIndexing.SlowIndexingHelpers
-  alias Pinchflat.Notifications.SourceNotifications
+  alias Pinchflat.Lifecycle.Notifications.SourceNotifications
 
   @doc """
   Starts the source slow indexing worker and creates a task for the source.