• Fix unhandled callback exceptions on async instruments
  (#2614)
• Rename DefaultCounter, DefaultHistogram, DefaultObservableCounter,
  DefaultObservableGauge, DefaultObservableUpDownCounter, DefaultUpDownCounter
  instruments to NoOpCounter, NoOpHistogram, NoOpObservableCounter,
  NoOpObservableGauge, NoOpObservableUpDownCounter, NoOpUpDownCounter
  (#2616)
• Deprecate InstrumentationLibraryInfo and Add InstrumentationScope
  (#2583)