[metrics SDK] Specification compliant MeterProvider

[dyladan]

• Constructor
  • MetricExporters depends on Define MetricExporter interfaces #2589
  • MetricReaders depends on Implement MetricReader #2590
  • Views depends on Implement Views API #2592
• Meter creation
• Shutdown feat(sdk-metrics-base): shutdown and forceflush on MeterProvider #2890
• ForceFlush feat(sdk-metrics-base): shutdown and forceflush on MeterProvider #2890
• Views depends on Implement Views API #2592
• optional: Config update (must propagate to created meters)
  • for now it may be easier to not allow configuration to be updated after creation as it is an optional feature.
  • the config is propagated through MeterProviderSharedState.
• Meter Identity:
  • Spec: Meter and instrument identity opentelemetry-specification#2226
  • Define if meters with different version/schemaUrl can create same name metrics.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 14 days.

[legendecas]

Updated the OP to include the undetermined issue to unblock #2666.

[legendecas]

Closing as all necessary PRs are merged.