Show barcodes that are not found inside the results UI

Includes a refactor to extract/cleanup barcode scan logic from the
component to a separate context with a better API.

lib/music_library/barcode_scan/result.ex

@@ -0,0 +1,36 @@
+defmodule MusicLibrary.BarcodeScan.Result do
+  defstruct [:status, :number, :record_id, :release]
+
+  def new(number, release) do
+    %__MODULE__{
+      number: number,
+      status: :new,
+      release: release
+    }
+  end
+
+  def wishlisted(number, record_id, release) do
+    %__MODULE__{
+      number: number,
+      status: :wishlisted,
+      record_id: record_id,
+      release: release
+    }
+  end
+
+  def collected(number, record_id, release) do
+    %__MODULE__{
+      number: number,
+      status: :collected,
+      record_id: record_id,
+      release: release
+    }
+  end
+
+  def not_found(number) do
+    %__MODULE__{
+      number: number,
+      status: :not_found
+    }
+  end
+end