Add LambdaExpressionUtils.java – Unique Lambda-Based Helper Functions

[farheen-shaikh530]

This PR adds a unique, creative file Functional/LambdaExpressionUtils.java that showcases Java 8+ lambda expressions through mini utilities using:
• Function<String, String> → Reverse a string
• Predicate → Check palindrome
• Consumer → Print shout version
• Function<Integer, Boolean> → Check if even
• Supplier → Random greeting generator

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.07%. Comparing base (e41c2b9) to head (d1ed98f).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6288      +/-   ##
============================================
+ Coverage     74.06%   74.07%   +0.01%     
  Complexity     5350     5350              
============================================
  Files           677      677              
  Lines         18648    18648              
  Branches       3621     3621              
============================================
+ Hits          13812    13814       +2     
+ Misses         4276     4275       -1     
+ Partials        560      559       -1     

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[siriak]

Please check if the proposed algorithms are already implemented elsewhere in the repository

[vil02]

@farheen-shaikh530: please update your branch.

[SrishtiSinha2003]

Could you provide some examples?

[siriak]

Lambda expressions are not algorithms, we don't add examples of usage of existing functionality