refactor: ColorContrastRatio

[alxkm]

Formatted Javadocs.
Tests moved from class to standard test.

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.19%. Comparing base (e782c7a) to head (b6c738d).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5457      +/-   ##
============================================
+ Coverage     52.04%   52.19%   +0.14%     
- Complexity     3239     3244       +5     
============================================
  Files           524      524              
  Lines         15178    15158      -20     
  Branches       2887     2881       -6     
============================================
+ Hits           7900     7912      +12     
+ Misses         6955     6922      -33     
- Partials        323      324       +1     

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