Implement and expose voltage metrics

[daniel-zullo-frequenz]

What's needed?

Voltage metrics. These metrics are essential as they cover a wide range of use cases in electrical systems

Proposed solution

The following metrics need to be implemented:

• Phase-to-phase voltage metric
• Phase-to-neutral voltage metric

Use cases

• Fault Detection: monitoring phase-to-neutral voltage might help in identifying faults or irregularities in the electrical system
• Three-Phase systems: phase-to-phase voltage is essential for assessing the voltage between different phases
  which might help in load balancing across different phases, ensuring uniform distribution and preventing overload conditions

Alternatives and workarounds

No response

Additional context

No response

[matthias-wende-frequenz]

We can use two different Sample3Phase receivers here. One that returns the phase-to-neutral voltages and the other that sends the phase-to-phase voltages.