add message codes

[AlexHaxe]

No description provided.

[codecov-io]

Codecov Report

Merging #436 into dev will increase coverage by <.01%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##              dev     #436      +/-   ##
==========================================
+ Coverage   91.99%   91.99%   +<.01%     
==========================================
  Files          90       90              
  Lines        8666     8673       +7     
  Branches      330      330              
==========================================
+ Hits         7972     7979       +7     
  Misses        392      392              
  Partials      302      302

Impacted Files	Coverage Δ
...eckstyle/checks/modifier/RedundantModifierCheck.hx	100% <100%> (ø)	⬆️
...rc/checkstyle/checks/literal/StringLiteralCheck.hx	97.59% <100%> (ø)	⬆️
src/checkstyle/checks/Check.hx	84.61% <100%> (+0.08%)	⬆️
src/checkstyle/utils/ExprUtils.hx	81.42% <100%> (+0.17%)	⬆️
src/checkstyle/checks/design/EmptyPackageCheck.hx	100% <100%> (ø)	⬆️
src/checkstyle/utils/ComplexTypeUtils.hx	81.68% <100%> (+0.18%)	⬆️
src/checkstyle/checks/imports/UnusedImportCheck.hx	95.52% <80%> (ø)	⬆️

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