Add Zalgorithm

[princegupta22]

Description

This PR adds the Z Algorithm implementation for efficient pattern matching in strings.

Algorithm Details

• Time Complexity: O(n + m) where n is text length and m is pattern length
• Space Complexity: O(n + m)
• Category: String algorithms
• Use Cases: Pattern matching, string searching, prefix computation

What's Included

• Complete Z Algorithm implementation with:
  • computeZArray() - computes Z array for a string
  • search() - finds all occurrences of pattern in text
  • Proper JavaDoc documentation
  • Working example in main() method
  • Edge case handling

Testing

• Code compiles without errors
• Main method demonstrates correct functionality
• Handles edge cases (null, empty strings)

• 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 0% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.57%. Comparing base (e6cb96f) to head (2cfe6d7).

Files with missing lines	Patch %	Lines
...ain/java/com/thealgorithms/strings/ZAlgorithm.java	0.00%	47 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6651      +/-   ##
============================================
- Coverage     75.74%   75.57%   -0.18%     
- Complexity     5771     5772       +1     
============================================
  Files           702      703       +1     
  Lines         19770    19817      +47     
  Branches       3832     3841       +9     
============================================
+ Hits          14975    14976       +1     
- Misses         4215     4262      +47     
+ Partials        580      579       -1     

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