Added BitwiseGCD.java and BitwiseGCDTest.java

[HetuKariya]

I created a new branch and have added the BitwiseGCD algorithm or Stein's Algorithm in the Bit manipulation folder also I have added the Test cases of the same in the file named BItwiseGCDTest.java. These test cases contain all the types of test cases from normal testcases of the range 1 - 1000 and also all the edge cases containing Long.min and Long.max thus all the testcases are covered closing #6542

• 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

❌ Patch coverage is 80.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.17%. Comparing base (09cacae) to head (32bd37c).

Files with missing lines	Patch %	Lines
.../com/thealgorithms/bitmanipulation/BitwiseGCD.java	80.00%	3 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6545      +/-   ##
============================================
+ Coverage     75.15%   75.17%   +0.01%     
- Complexity     5594     5610      +16     
============================================
  Files           688      689       +1     
  Lines         19361    19396      +35     
  Branches       3744     3753       +9     
============================================
+ Hits          14551    14581      +30     
- Misses         4245     4247       +2     
- Partials        565      568       +3     

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[alxkm]

Looks good, thank you for contribution