Reset monthly peak component

[Flix6x]

For Dutch large consumers, the peak cost component "resets" monthly. If the planning window spans across 2 months, this should be reflected in the commitment groups.

Follow-up from #1144.

Current behaviour

For a planning window spanning across 2 months, the monthly peak of the 1st month is used for the second month as well.

Workaround

Set both the site-peak-consumption and site-peak-production to "0 kW" to manually reset if the planning window crosses a month's end. This has the downside of not freely using the already established headroom in the 1st month (only for the part of the planning window that falls within the 1st month).

Expected behaviour

The commitment groups should be split up by event. For instance, if the sensor recording monthly peaks has an event resolution of 1 month, this should result in a separate commitment group for each month.