HackWeek - Feature Flags Support

[marandaneto]

📜 Description

This PR adds Feature Flags Support for the Dart/Flutter SDK.
This is a HackWeek project only.
Spec https://github.com/getsentry/hackweek-feature-flags

#skip-changelog

💡 Motivation and Context

💚 How did you test it?

📝 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-commenter]

Codecov Report

Attention: Patch coverage is 46.46272% with 280 lines in your changes missing coverage. Please review.

Project coverage is 83.64%. Comparing base (c76b7ca) to head (0fac27e).
Report is 1085 commits behind head on main.

Files with missing lines	Patch %	Lines
dart/lib/src/typed_data/typed_buffer.dart	29.06%	122 Missing ⚠️
dart/lib/src/sentry_client.dart	10.66%	67 Missing ⚠️
dart/lib/src/hub.dart	12.90%	27 Missing ⚠️
dart/lib/src/cryptography/digest.dart	4.76%	20 Missing ⚠️
dart/lib/src/hub_adapter.dart	0.00%	8 Missing ⚠️
dart/lib/src/sentry.dart	11.11%	8 Missing ⚠️
dart/lib/src/transport/http_transport.dart	58.33%	5 Missing ⚠️
dart/lib/src/utils/hash_code.dart	0.00%	5 Missing ⚠️
dart/lib/src/feature_flags/feature_flag_info.dart	0.00%	4 Missing ⚠️
dart/lib/src/noop_hub.dart	0.00%	4 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #984      +/-   ##
==========================================
- Coverage   89.55%   83.64%   -5.91%     
==========================================
  Files         106      120      +14     
  Lines        3322     3834     +512     
==========================================
+ Hits         2975     3207     +232     
- Misses        347      627     +280     

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[getsantry]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you remove the label Waiting for: Community, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀