Support metric.metadata in pdata/pmetric #10006
Merged
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Description
After #9985, add support for the new metric.metadata field in the pmetric package.
I plan to use the metric.metadata field to support additional prometheus types per https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/prometheus_and_openmetrics.md#metric-metadata