Add Power of Four Check using bit manipulation

[krishna-medapati]

Fixes #6940

Description

Added a utility class to check if a number is a power of four using efficient bit manipulation.

Implementation Details

• Uses bit manipulation to check if a number is a power of four in O(1) time
• Verifies the number is a power of two: (n & (n-1)) == 0
• Checks if the set bit is at an even position using mask 0x55555555
• Follows the existing code style and structure of the repository

Changes Made

• Created PowerOfFour.java with isPowerOfFour() method
• Added comprehensive unit tests in PowerOfFourTest.java
• Included JavaDoc documentation

Testing

All test cases pass:

• Powers of four: 1, 4, 16, 64, 256, 1024
• Non-powers of four: 2, 3, 5, 8, 15, 32
• Edge cases: 0, -1, -4

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.34%. Comparing base (a008cc2) to head (5fb478e).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7065      +/-   ##
============================================
+ Coverage     78.33%   78.34%   +0.01%     
- Complexity     6670     6677       +7     
============================================
  Files           753      754       +1     
  Lines         22185    22190       +5     
  Branches       4356     4359       +3     
============================================
+ Hits          17378    17385       +7     
+ Misses         4107     4106       -1     
+ Partials        700      699       -1     

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