feat: Mobile Vitals - Native Frames

[denrase]

📜 Description

• Sentry navigator will fetch native frames over native channel and append to SentryTransaction for transaction created automatically between navigation.

• Introduce onFinish callback when starting transactions.

• Introduce enableAutoPerformanceTracking flag in flutter options.

• Bump sentry-android to 5.6.3

💡 Motivation and Context

Implement native frame tracking of mobile vitals.

💚 How did you test it?

• Ran iOS/Android example application.
• Unit tests.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

More tests!

[codecov-commenter]

Codecov Report

Merging #772 (41590bf) into feat/mobile-vitals (29f47ff) will increase coverage by 0.85%.
The diff coverage is 79.71%.

@@                  Coverage Diff                   @@
##           feat/mobile-vitals     #772      +/-   ##
======================================================
+ Coverage               89.47%   90.33%   +0.85%     
======================================================
  Files                     110       22      -88     
  Lines                    3469      621    -2848     
======================================================
- Hits                     3104      561    -2543     
+ Misses                    365       60     -305     

Impacted Files	Coverage Δ
flutter/lib/src/sentry_flutter_options.dart	72.72% <ø> (ø)
.../lib/src/navigation/sentry_navigator_observer.dart	85.89% <23.07%> (-12.59%)	⬇️
...src/integrations/native_app_start_integration.dart	77.77% <75.00%> (ø)
flutter/lib/src/sentry_flutter.dart	96.00% <83.33%> (+0.16%)	⬆️
flutter/lib/src/sentry_native_channel.dart	92.00% <92.00%> (ø)
...nt_processor/native_app_start_event_processor.dart	92.30% <100.00%> (-1.45%)	⬇️
flutter/lib/src/sentry_native.dart	100.00% <100.00%> (ø)
dart/lib/src/hub.dart
dart/lib/src/hub_adapter.dart
dart/lib/src/noop_hub.dart
... and 85 more

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[marandaneto]

@denrase LGTM, left just a comment tho, https://github.com/getsentry/sentry-dart/pull/772/files#r828893553
@brustolin please double-check :)

[brustolin]

LGTM

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

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