feat: add johnson's algorithm

[saahil-mahato]

• 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 63.88%. Comparing base (31de2db) to head (c16be86).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5712      +/-   ##
============================================
+ Coverage     63.74%   63.88%   +0.14%     
- Complexity     4134     4167      +33     
============================================
  Files           579      580       +1     
  Lines         16209    16273      +64     
  Branches       3120     3140      +20     
============================================
+ Hits          10332    10396      +64     
  Misses         5453     5453              
  Partials        424      424              

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[saahil-mahato]

@alxkm Please review this. Thanks.

[siriak]

Looks good, thanks!