Add show_stored_node script

[balloob]

Add a script to parse a node dump or a matter_experimental custom integration storage file and print out all nodes and the entities they map to.

Added the output of the lighting example app as a fixture and run CI against it. This can be expanded to a lot more entities in the future.

❯ python3 -m scripts.show_stored_node tests/fixtures/nodes/lighting-example-app.json
<MatterNode 4337>
  <MatterDevice DimmableLight (N:4337, E:1)>
    - Platform: light
      entity_cls: MatterLight
      Subscriptions:
       - OnOff.Attributes.OnOff
       - LevelControl.Attributes.CurrentLevel