feat: avoid-non-ascii-symbols rule

[incendial]

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:

#819

[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: 424

• Total lines of source code: 7442

• Total classes: 290

• Average Cyclomatic Number per line of code: 0.35

• Average Source Lines of Code per method: 6

• Total tech debt: 1318.0 hours

• Found issues: 6 ⚠

[incendial]

@fzyzcjy fyi, hope I got the idea right

[codecov]

Codecov Report

Merging #825 (8313346) into master (374f392) will increase coverage by 0.01%.
The diff coverage is 95.83%.

❗ Current head 8313346 differs from pull request most recent head 20392e1. Consider uploading reports for the commit 20392e1 to get more accurate results

@@            Coverage Diff             @@
##           master     #825      +/-   ##
==========================================
+ Coverage   87.28%   87.30%   +0.01%     
==========================================
  Files         277      279       +2     
  Lines        5907     5922      +15     
==========================================
+ Hits         5156     5170      +14     
- Misses        751      752       +1     

Impacted Files	Coverage Δ
...c/analyzers/lint_analyzer/rules/rules_factory.dart	94.31% <0.00%> (-1.09%)	⬇️
...on_ascii_symbols/avoid_non_ascii_symbols_rule.dart	100.00% <100.00%> (ø)
...es/rules_list/avoid_non_ascii_symbols/visitor.dart	100.00% <100.00%> (ø)
...ib/src/config_builder/models/analysis_options.dart	91.04% <0.00%> (-0.63%)	⬇️
lib/src/utils/node_utils.dart	100.00% <0.00%> (ø)
...es/rules_list/prefer_immediate_return/visitor.dart	100.00% <0.00%> (ø)
...immediate_return/prefer_immediate_return_rule.dart	100.00% <0.00%> (ø)

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[fzyzcjy]

@fzyzcjy fyi, hope I got the idea right

Sure, the idea is right