Separate Current Limits for 1 and 3 Phase Charging

[CNCKitchen]

Is your feature request related to a problem? Please describe.
I want to avoid low efficient charging at 6A/1Phase but allow more efficient 6A/3Phase charging. Currently I can only set current limits that apply to both 1 and 3 phase charging, so this isn't possible.

Describe the solution you'd like
Have separate current limits for 1 and 3 phase.

Describe alternatives you've considered
Waste a lot of energy on slow and low current 1 Phase charging.

Additional context
N/A

[StefanSchoof]

See #14661