Introduce minimum bounds for active power

[tiyash-basu-frequenz]

What's needed?

The API supports setting maximum bounds for active power, but not for setting minimum bounds. The API should have the ability to set minimum bounds.

Proposed solution

The Metric and the MetricAggregation messages contain maximum bounds as of now. These need to be refactored for having minimum bounds as well.

Also, the SetBoundsParam message has to be refactored to allow adding minimum bounds.

Use cases

This is useful when we want to prevent agents from charging or discharging with too low power. This can be used, e.g., to limit minimum charging power to a high enough value so that a peak-shaver agebt does not interfere with the DC heater agent.

Alternatives and workarounds

No response

Additional context

No response