Dev: Added Germain and Safe prime utility class

[BanulaKumarage]

• 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.49%. Comparing base (16557a9) to head (b0c2295).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6611      +/-   ##
============================================
+ Coverage     76.48%   76.49%   +0.01%     
- Complexity     6001     6010       +9     
============================================
  Files           717      718       +1     
  Lines         20290    20296       +6     
  Branches       3933     3935       +2     
============================================
+ Hits          15518    15526       +8     
+ Misses         4181     4180       -1     
+ Partials        591      590       -1     

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[BanulaKumarage]

Hi @alxkm, could you please review this PR?