[Enhancement] Add rate limiting to yt-dlp requests; prevent saving Media Items when throttled by YouTube (#559)

* Added sleep interval to settings

* Added new sleep setting to yt-dlp runner and added tests

* Added setting for form; updated setting name

* Updated form label

* Prevented saving/updating of media items if being throttled by youtube

* Added the bot message to the list of non-retryable errors

* Fixed typo

priv/repo/migrations/20250110231704_add_extractor_sleep_interval_to_settings.exs

@@ -0,0 +1,9 @@
+defmodule Pinchflat.Repo.Migrations.AddExtractorSleepIntervalToSettings do
+  use Ecto.Migration
+
+  def change do
+    alter table(:settings) do
+      add :extractor_sleep_interval_seconds, :number, null: false, default: 0
+    end
+  end
+end