co⚡e: Sparkplug™ MQTT edge

First pass at assigning remote metrics from NBIRTH

FB_RemoteMetric now contains two IStorageMetrics, so that the Payload can provide storage metrics for BIRTHS even when it has already given the metrics away to another MetricOwner.
One of these is registered with the Host._AllMetricsList, while the other is registered with the Host._MetricsPool, and will be later donated to a MetricOwner.

This featurebranch is ment to be the root for the PrimaryHost Feature.

Once the feauture has been completed it will either replace or be merged with the trunk