flutter min version test

[marandaneto]

📜 Description

TODO: changelog
#skip-changelog

Bump Flutter to min 2.0.0
Add CI step that compiles using Flutter's min. supported version now 2.0.0 and Dart 2.12.0
Fix hashCode issue.
Add dependency for logging and dio so they are compiled against the min. version as well.

💡 Motivation and Context

Fixes #962
Fixes #636

💚 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

Merging #966 (fc4c7ca) into main (6750ca1) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #966      +/-   ##
==========================================
+ Coverage   89.51%   89.55%   +0.04%     
==========================================
  Files         105      106       +1     
  Lines        3308     3322      +14     
==========================================
+ Hits         2961     2975      +14     
  Misses        347      347              

Impacted Files	Coverage Δ
...lib/src/client_reports/client_report_recorder.dart	100.00% <100.00%> (ø)
dart/lib/src/utils/hash_code.dart	100.00% <100.00%> (ø)

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[marandaneto]

@ueman found one more issue:

../dart/lib/src/client_reports/client_report_recorder.dart:46:30: Error: Method not found: 'Object.hash'.
  int get hashCode => Object.hash(reason, category);

[brustolin]

LGTM