feat: cleanup public API

[incendial]

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

• Documentation update
• Bug fix
• New rule
• Changes an existing rule
• Add autofixing to a rule
• Add a CLI option
• Add something to the core
• Other, please explain: cleanup public API before major release

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[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: 515

• Total lines of source code: 8852

• Total classes: 388

• Average Cyclomatic Number per line of code: 0.37 / 1

• Average Source Lines of Code per method: 6

• Total tech debt: 1668.0 hours

• Found issues: 5 ⚠

[codecov]

Codecov Report

Merging #1053 (ecaff7b) into master (4fcdb0d) will decrease coverage by 0.08%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master    #1053      +/-   ##
==========================================
- Coverage   86.47%   86.38%   -0.09%     
==========================================
  Files         326      326              
  Lines        6933     6904      -29     
==========================================
- Hits         5995     5964      -31     
- Misses        938      940       +2     

Impacted Files	Coverage Δ
.../anti_patterns/anti_patterns_list/long_method.dart	100.00% <ø> (ø)
...tterns/anti_patterns_list/long_parameter_list.dart	100.00% <ø> (ø)
lib/src/analyzers/lint_analyzer/lint_analyzer.dart	93.63% <0.00%> (ø)
...yzer/models/summary_lint_report_record_status.dart	100.00% <ø> (ø)
...ters_list/checkstyle/lint_checkstyle_reporter.dart	98.07% <ø> (ø)
..._list/code_climate/lint_code_climate_reporter.dart	100.00% <ø> (ø)
.../reporters_list/console/lint_console_reporter.dart	100.00% <ø> (ø)
...orters/reporters_list/html/lint_html_reporter.dart	0.31% <ø> (ø)
...console/unnecessary_nullable_console_reporter.dart	4.00% <ø> (ø)
..._list/json/unnecessary_nullable_json_reporter.dart	0.00% <ø> (ø)
... and 30 more

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