Aggregation reporter

[nhoening]

In projects, a common ask is that several sensors (often of the same kind) should be available as aggregated signal. For example, all PV assets on a site should be aggregated so we can forecast the overall available PV energy (ans use that sensor in our flex scheduling).

The new AggregationReporter is not just a Pandas pipeline but includes some actual logic:

• Allow to aggregate from everything below a certain asset (often, a site asset) - so it gets an asset parameter
• Sensors identified by ID list or filtering criteria (name-regex, units) - adding three kinds of optional params
• The reporter handle unit conversions and resampling to target output sensor
• Check if the reporter runs well as a data generator, that is, as an automation (if report-automation PR Reports as jobs and as automations #2297 is far enough). Its data source should be accountable.
• Also, we can check compatibility with it being listed as template, see Prepared report templates #2300