Feat: sentry and sentry_flutter null safety

[marandaneto]

📜 Description

Feat: sentry and sentry_flutter null safety

#skip-changelog

💡 Motivation and Context

#247

💚 How did you test it?

running and 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

[codecov-io]

Codecov Report

Merging #335 (32d09c8) into main (4a7d680) will increase coverage by 2.96%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
+ Coverage   86.64%   89.60%   +2.96%     
==========================================
  Files          52       51       -1     
  Lines        1759     1636     -123     
==========================================
- Hits         1524     1466      -58     
+ Misses        235      170      -65     

Impacted Files	Coverage Δ
dart/lib/src/hub_adapter.dart	16.66% <ø> (ø)
dart/lib/src/isolate_error_integration.dart	90.00% <ø> (ø)
dart/lib/src/noop_client.dart	14.81% <0.00%> (ø)
dart/lib/src/noop_hub.dart	33.33% <ø> (ø)
dart/lib/src/protocol/browser.dart	100.00% <ø> (ø)
dart/lib/src/protocol/gpu.dart	100.00% <ø> (ø)
dart/lib/src/protocol/operating_system.dart	97.36% <ø> (ø)
dart/lib/src/protocol/sdk_info.dart	100.00% <ø> (ø)
dart/lib/src/protocol/sentry_runtime.dart	100.00% <ø> (ø)
flutter/lib/src/sentry_flutter_options.dart	66.66% <16.66%> (+7.97%)	⬆️
... and 30 more

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