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

• [x] New Algorithm / Data Structure

Checklist

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