feat: add maximum element in array implementation

[AbhiramSakha]

• 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
  Added implementation for finding maximum element in an array.

• Uses efficient O(n) traversal

• Beginner-friendly implementation

• Follows project structure and coding standards

This enhances the arrays algorithms collection.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.40%. Comparing base (7d57c57) to head (73770b2).

Files with missing lines	Patch %	Lines
.../java/com/thealgorithms/arrays/MaximumElement.java	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7316      +/-   ##
============================================
- Coverage     79.43%   79.40%   -0.03%     
+ Complexity     7062     7060       -2     
============================================
  Files           788      789       +1     
  Lines         23124    23130       +6     
  Branches       4545     4547       +2     
============================================
- Hits          18368    18367       -1     
- Misses         4022     4027       +5     
- Partials        734      736       +2     

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[AbhiramSakha]

Hi, all required checks (build, checkstyle, structure) are passing.
The remaining failure seems related to a workflow configuration issue.
Please let me know if any changes are needed from my side.