Add BinarySearchStrings algorithm with comprehensive tests

[JeevanYewale]

• 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 algorithms include a corresponding test class that validates their functionality.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.07%. Comparing base (79cdb98) to head (4c84658).

Files with missing lines	Patch %	Lines
...om/thealgorithms/searches/BinarySearchStrings.java	93.10%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7221      +/-   ##
============================================
+ Coverage     79.05%   79.07%   +0.01%     
- Complexity     6946     6957      +11     
============================================
  Files           779      780       +1     
  Lines         22908    22937      +29     
  Branches       4502     4508       +6     
============================================
+ Hits          18110    18137      +27     
- Misses         4077     4078       +1     
- Partials        721      722       +1     

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