Refactor: Replace Swap and Comparison Methods with SortUtils Utility Methods

[alxkm]

The HeapSort class had duplicated methods for less and swap, which already exist in SortUtils.

It is better to use the common methods instead of the old ones.

This pull request also includes some renaming for clarity.

• 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 39.70%. Comparing base (e8f1990) to head (112aabd).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5246      +/-   ##
============================================
- Coverage     39.71%   39.70%   -0.02%     
+ Complexity     2433     2430       -3     
============================================
  Files           517      517              
  Lines         15496    15492       -4     
  Branches       2958     2958              
============================================
- Hits           6155     6151       -4     
  Misses         9052     9052              
  Partials        289      289              

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