Update metrics to support OpenTelemetry specification #5120
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This PR expands the metrics artifacts to support OpenTelemetry.
To see how this will be used, I did a proof-of-concept. The final work will change somewhat, but this should explain the changes.
Listener is here: https://github.com/CodeBlanch/dotnet-monitor/blob/b84ba9229f5996d99f934ef862008c138d294b0e/src/Tools/dotnet-monitor/OpenTelemetry/OpenTelemetryService.cs#L374
MetricsStore gains an OTel-style snapshot which understands how to do proper delta aggregation using some of these changes: https://github.com/CodeBlanch/dotnet-monitor/blob/b84ba9229f5996d99f934ef862008c138d294b0e/src/Microsoft.Diagnostics.Monitoring.WebApi/Metrics/MetricsStore.cs#L161-L178
The aggregated data is exported periodically as a "metrics producer" in the OTel world: https://github.com/CodeBlanch/dotnet-monitor/blob/b84ba9229f5996d99f934ef862008c138d294b0e/src/Tools/dotnet-monitor/OpenTelemetry/OpenTelemetryService.cs#L378
/cc @noahfalk @samsp-msft @rajkumar-rangaraj @wiktork