Add support for Virtual VE.Bus device in victron-virtual node[Feature]

[danikalt]

Feature Request

Description:
Currently, the victron-virtual node allows creating virtual devices such as Battery, Grid meter, PV inverter, Meteo, etc.
However, there is no option to create a Virtual VE.Bus (Inverter/Charger) device.

This would be very useful for advanced simulation and integration scenarios:

To report /Ac/Out/L1..3/Power values for Total Consumption in VRM dashboard.

To report /Dc/0/Power values (positive = discharge, negative = charge) for From/To Battery flows in VRM dashboard.

Without a VE.Bus option, users cannot simulate consumption and battery flows together, since:

Battery device only exposes DC values but not AC outputs.

Grid meter / PV inverter do not provide the correct VRM flows for consumption.

Requested enhancement:
Add a new device type VE.Bus to the victron-virtual node, which exposes at least the following paths:

/Ac/Out/L1/Power, /Ac/Out/L2/Power, /Ac/Out/L3/Power

/Dc/0/Power, /Dc/0/Voltage, /Dc/0/Current

/Soc (optional, if available)

Benefit:
This would allow Node-RED users to fully emulate a VE.Bus inverter/charger for VRM dashboards, making the energy flows (Grid ↔ Consumption, Battery ↔ Consumption, PV ↔ Consumption) visible without physical hardware.