Dump price data at specific times to enable debugging and development

[dala318]

Add a way to automatically or manually dump a set of Nordpool entity data values to a human-readable and editable format (suggest json or yaml) that can be used later when debugging and developing integration.

[dala318]

Should likely use the diagnostics function for this, example async_get_config_entry_diagnostics in diagnostics.py HAsmartirrigation and create command-line executor with stubbed entities that read data from the diagnostics files instead and iterates over the hours in data and prints every event to the command line.