style: enable ModifierOrder in checkstyle

[marysiuniq]

I enabled ModifierOrder in checkstyle.

Related to #5119.

• 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 37.33%. Comparing base (fd65892) to head (5a5171a).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5132      +/-   ##
============================================
- Coverage     37.35%   37.33%   -0.02%     
+ Complexity     2350     2349       -1     
============================================
  Files           517      517              
  Lines         15622    15622              
  Branches       2971     2971              
============================================
- Hits           5836     5833       -3     
- Misses         9499     9500       +1     
- Partials        287      289       +2     

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[vil02]

Thanks!