[prometheus] Stabilize Prometheus -> OTLP: Native Histograms

[dashpole]

What are you trying to achieve?

Stabilize https://opentelemetry.io/docs/specs/otel/compatibility/prometheus_and_openmetrics/#native-histograms.

It would be helpful to add more links to the prometheus native histogram documentation. In particular, link to the bucket layout documentation, and link to documentation for the float histograms and gauge histograms.

Native Histograms with Schema outside of the range [-4, 8] MUST be dropped.

This is missing a CBNH (schema = -53) specification.

@krajorama let me know if you are interested in owning this