require specific sets of metrics when implementation is based on Micrometer

[donbourne]

In order to increase consistency of metrics available between vendors using Micrometer as their MP Metrics implementation we could have a required set of metrics. These would be the "base" scope metrics.

as an example of some of the metrics sets that we may want to require, see https://micrometer.io/docs/ref/jvm
new ClassLoaderMetrics().bindTo(registry); (1)
new JvmMemoryMetrics().bindTo(registry); (2)
new JvmGcMetrics().bindTo(registry); (3)
new ProcessorMetrics().bindTo(registry); (4)
new JvmThreadMetrics().bindTo(registry); (5)

note that in our group discussion from July 12, 2022 we hadn't fully decided whether this was a good idea. The "pro" side would be improved consistency, the "con" side would be tighter tie-in to Micrometer-specifics when using Micrometer.