Added-> DisjointUnion Set by Size

[TIWARIPRIYANSH]

• 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 75.12%. Comparing base (d09180e) to head (1c14cfc).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6514      +/-   ##
============================================
+ Coverage     75.10%   75.12%   +0.02%     
- Complexity     5571     5577       +6     
============================================
  Files           685      686       +1     
  Lines         19307    19327      +20     
  Branches       3732     3734       +2     
============================================
+ Hits          14500    14519      +19     
  Misses         4245     4245              
- Partials        562      563       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.