[Epic] App Start/TTID instrumentation improvements

[kahest]

This is a meta-issue for a number of instrumentation improvements on various SDKs.

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1. Check app start spans time and foreground state sentry-java#3550
   +0
2. fix: Long-lasting TTID/TTFD spans sentry-cocoa#4225
   +0
3. fix(ttid): End and measure TTID regardless current active span sentry-react-native#4019
   +0
4. feat(ttd): TimeToInitialDisplay and TimeToFullDisplay start the time to display spans on mount sentry-react-native#4020
   +0
5. Use appLaunchedInForeground to determinate invalid app start data on Android sentry-react-native#3995
   Platform: React-Native +1
   
6. Use appLaunchedInForeground to determinate invalid app start data on Android sentry-dart#2215
   Platform: Dart +1
   

[antonis]

@kahest with getsentry/sentry-react-native#3995 merged I think we can close this epic.