Add MaxAlternatingSum algorithm implementation

[Jashnavi25]

This PR adds a Java implementation of Max Alternating Sum to the devutils package.

Includes:
✔ Javadoc documentation
✔ Clean formatting and package declaration
✔ Sorting + arithmetic based optimal algorithm
✔ Follows TheAlgorithms conventions

Time Complexity: O(n log n)
Space Complexity: O(n)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.44%. Comparing base (fa8ea8e) to head (3e1a4b2).

Files with missing lines	Patch %	Lines
.../com/thealgorithms/devutils/MaxAlternatingSum.java	0.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7085      +/-   ##
============================================
- Coverage     78.50%   78.44%   -0.06%     
+ Complexity     6752     6750       -2     
============================================
  Files           759      760       +1     
  Lines         22402    22416      +14     
  Branches       4400     4403       +3     
============================================
- Hits          17587    17585       -2     
- Misses         4109     4123      +14     
- Partials        706      708       +2     

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[Jashnavi25]

Hi maintainers 👋

This PR adds a new algorithm MaxAlternatingSum to the devutils package,
with documentation and proper formatting.

All checks passed successfully ✔️

Kindly review when you get time.
Thank you! 🙏

[github-actions]

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[github-actions]

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