Added Power of Four Check (Bit Manipulation)

[Shewale41]

Description

This PR adds an implementation to check whether a number is a power of four
using bit manipulation.

The algorithm ensures that:

• The number is positive.
• It has exactly one set bit.
• The set bit is at an even position.

Type of change

• New Algorithm / Data Structure

Checklist

• Code follows TheAlgorithms/Java style and package structure
• SpotBugs, Checkstyle, and CodeQL pass successfully
• Added comprehensive JUnit test cases
• Added Javadoc documentation
• Verified output with multiple test examples

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.06349% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.39%. Comparing base (21eff8a) to head (f58388c).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...ithms/datastructures/trees/ThreadedBinaryTree.java	90.19%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6999      +/-   ##
============================================
+ Coverage     78.26%   78.39%   +0.12%     
- Complexity     6573     6639      +66     
============================================
  Files           743      749       +6     
  Lines         21895    22078     +183     
  Branches       4288     4331      +43     
============================================
+ Hits          17137    17308     +171     
- Misses         4074     4080       +6     
- Partials        684      690       +6     

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[Shewale41]

Hey @DenizAltunkapan @yanglbme @alxkm 👋 can you please review this PR , I have cleared all the checks can you merge my PR.
Thanks.

[DenizAltunkapan]

already exists in https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/PowerOfFour.java