Maps with Key Object, Object would fail during serialization if not String, Object

[marandaneto]

📜 Description

Maps with Key Object, Object would fail during serialization if not String, Object

💡 Motivation and Context

Fixes #898

💚 How did you test it?

Running 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

Merging #935 (bed2386) into main (872c63d) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #935      +/-   ##
==========================================
+ Coverage   89.80%   89.81%   +0.01%     
==========================================
  Files         104      104              
  Lines        3207     3211       +4     
==========================================
+ Hits         2880     2884       +4     
  Misses        327      327              

Impacted Files	Coverage Δ
dart/lib/src/protocol/breadcrumb.dart	100.00% <100.00%> (ø)
dart/lib/src/protocol/mechanism.dart	100.00% <100.00%> (ø)
dart/lib/src/protocol/sentry_event.dart	100.00% <100.00%> (ø)

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[brustolin]

LGTM