Use dedicated http client pool for MusicBrainz

lib/music_brainz/supervisor.ex

@@ -0,0 +1,16 @@
+defmodule MusicBrainz.Supervisor do
+  use Supervisor
+
+  def start_link(config) do
+    Supervisor.start_link(__MODULE__, config, name: __MODULE__)
+  end
+
+  @impl true
+  def init(_config) do
+    children = [
+      {Finch, name: MusicBrainz.Finch}
+    ]
+
+    Supervisor.init(children, strategy: :one_for_one)
+  end
+end