feat: add Naive Pattern Search algorithm

[Karthikn-VR]

This commit adds the Naive Pattern Search algorithm implementation in Java. The algorithm scans the text from left to right and checks each substring of length m (pattern length) to find matches.

• New class: NaivePatternSearch.java
• Provides search(String text, String pattern) method returning all match indices
• Includes a sample main() for demonstration

Time Complexity: O(n * m)
Space Complexity: O(1)

• 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 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.06%. Comparing base (e78d53d) to head (a3083ec).

Files with missing lines	Patch %	Lines
.../com/thealgorithms/strings/NaivePatternSearch.java	0.00%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6505      +/-   ##
============================================
- Coverage     75.09%   75.06%   -0.03%     
- Complexity     5569     5570       +1     
============================================
  Files           686      687       +1     
  Lines         19307    19316       +9     
  Branches       3732     3734       +2     
============================================
+ Hits          14498    14499       +1     
- Misses         4245     4254       +9     
+ Partials        564      563       -1     

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[DenizAltunkapan]

Please fix the checkstyle issues that cause the failing build check @Karthikn-VR