Ability to pull 'operational_mode' data from sunvault battery into HASS

[dlp688]

Would like to have the integration pull the 'operational_mode' data from the sunvault battery into HASS so that its easier to validate the current state of the battery. The two modes it should show are "ENERGY_ARBITRAGE" OR "SELF_CONSUMPTION"

It should just be another json value from data that is already being extracted; I just don't know how to do it without breaking anything.

thanks