feat: add static code diagnostic avoid-use-expanded-as-spacer

[vlkonoshenko]

…ps://dartcodemetrics.dev/docs/rules/flutter/avoid-use-expanded-as-spacer).

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix
[X] New rule
[ ] Changes an existing rule
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

#898

What changes did you make? (Give an overview)

Is there anything you'd like reviewers to focus on?

[github-actions]

Dart Code Metrics unused files report of dart_code_metrics. ✅

Summary

• Scanned package folders: bin, example, lib
• No unused files found! ✅

[github-actions]

Dart Code Metrics analyze report of dart_code_metrics. ✅

Summary

• Scanned folders: bin, example, lib, test

• Total scanned files: 448

• Total lines of source code: 7974

• Total classes: 310

• Average Cyclomatic Number per line of code: 0.35

• Average Source Lines of Code per method: 6

• Total tech debt: 1410.0 hours

• Found issues: 6 ⚠

[codecov]

Codecov Report

Merging #903 (7570f4c) into master (58f067d) will increase coverage by 0.02%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #903      +/-   ##
==========================================
+ Coverage   86.77%   86.79%   +0.02%     
==========================================
  Files         296      298       +2     
  Lines        6297     6325      +28     
==========================================
+ Hits         5464     5490      +26     
- Misses        833      835       +2     

Impacted Files	Coverage Δ
...c/analyzers/lint_analyzer/rules/rules_factory.dart	91.20% <0.00%> (-2.05%)	⬇️
...anded_as_spacer/avoid_expanded_as_spacer_rule.dart	100.00% <100.00%> (ø)
...s/rules_list/avoid_expanded_as_spacer/visitor.dart	100.00% <100.00%> (ø)

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[incendial]

What about just SizedBox? It's not the same as Spacer?

[konoshenko]

@incendial Spacer semantically correct than SizeBox. SizeBox work like a Container.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information