Change Channel to Source (#12)

* Ensure channel detail lookup doesn't download the video - oops

* Ran the needful migrations for replacing channels with sources

* got media source test back working

* channel tasks test

* Media indexing worker test

* media tests

* Got all tests working except controller tests

* got all tests working

* Renamed Channel struct to Source

* renamed ChannelTasks

* More renaming; renamed channel details module

* Removed Channel yt-dlp module, instead throwing things in the VideoCollection module

* Renamed what looks like the last of the outstanding data

priv/repo/migrations/20240202043042_drop_channels_table.exs

@@ -0,0 +1,21 @@
+defmodule Pinchflat.Repo.Migrations.DropChannelsTable do
+  use Ecto.Migration
+
+  def up do
+    drop table(:channels)
+  end
+
+  def down do
+    create table(:channels) do
+      add :name, :string, null: false
+      add :channel_id, :string, null: false
+      add :original_url, :string, null: false
+      add :media_profile_id, references(:media_profiles, on_delete: :restrict), null: false
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create index(:channels, [:media_profile_id])
+    create unique_index(:channels, [:channel_id, :media_profile_id])
+  end
+end