[FEATURE REQUEST] Support for multi-phase grid power supply

[cogentcoder]

Is your feature request related to a problem? Please describe.
The card does not provide multiple phase for the grid, therefore it is impossible to monitor phases separately. In my case, the heavy loads are on 2 phases while lighter load is on 1 phase via an inverter/battery backup system of this 3 phase system as we have load shedding issue in our region.

Describe the solution you'd like
If we can add the multiple phases like Energy dashboard in HA which in fact support multi-phase, the problem can be solved. I can think a viable option that additional fields can be given to add two other phases of 3 phase grid supply which can be clubbed under grid supply but behave like individual entity so they are marked on the cards with different lines toward their consumption. Such as 2 phases going to home consumptions, while one phase going to inverter/battery and then going to home consumption. It doesn't show any breakup to inverter/battery system because battery system does not accept multiple option for production/consumptions either. I have solar panels so i can add production to battery but another production for the battery is one of the phase via inverter which also charge it. Consumption line is one toward home consumption.

Describe alternatives you've considered
I have combined all phases into single entity, it can show the total consumption from the grid supply but then it is not a solution as it doesn't show per phase consumption.