Allow sentry user to control resolution of captured Flutter screenshots

[denrase]

📜 Description

• Introduce SentryscreenshotQulity
• Render screenshots according to quality
• We now also support full resolution instead of just rendering logical pixels

Full Quality:

Small Quality:

💡 Motivation and Context

Closes #1200

💚 How did you test it?

Ran different resolutions with sample app.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

[github-actions]

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

Generated by 🚫 dangerJS against 8f236fd

[codecov]

Codecov Report

Patch coverage: 98.10% and project coverage change: +1.56 🎉

Comparison is base (c60752d) 88.73% compared to head (8f236fd) 90.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##           v7.0.0    #1288      +/-   ##
==========================================
+ Coverage   88.73%   90.30%   +1.56%     
==========================================
  Files         122      165      +43     
  Lines        3818     5186    +1368     
==========================================
+ Hits         3388     4683    +1295     
- Misses        430      503      +73     

Impacted Files	Coverage Δ
dart/lib/src/protocol/contexts.dart	93.89% <ø> (-0.05%)	⬇️
dart/lib/src/protocol/max_body_size.dart	50.00% <ø> (ø)
dart/lib/src/protocol/sentry_baggage_header.dart	100.00% <ø> (ø)
dart/lib/src/protocol/sentry_response.dart	82.75% <ø> (ø)
dart/lib/src/protocol/sentry_transaction_info.dart	70.00% <ø> (ø)
dart/lib/src/sentry_baggage.dart	90.90% <ø> (ø)
dart/lib/src/sentry_span_interface.dart	100.00% <ø> (ø)
dart/lib/src/sentry_trace_context_header.dart	100.00% <ø> (ø)
dart/lib/src/version.dart	100.00% <ø> (ø)
file/lib/src/sentry_file_extension.dart	80.00% <ø> (ø)
... and 69 more

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[marandaneto]

@denrase can we add testing for the screen quality?

[denrase]

@marandaneto Will check if we can add an integration test.

[marandaneto]

Thanks @denrase