ConvexHull Hashset Loss of order fix

[yadhu-vipin]

This PR fixes an issue in the ConvexHull class where the recursive method returned hull points in an unordered fashion due to the use of a HashSet. This caused algorithms that rely on vertex order, such as Rotating Calipers, to produce incorrect results (e.g., incorrect minimum bounding rectangle areas).

The fix preserves the counter-clockwise (CCW) order of the hull points while maintaining all points that lie on the convex polygon. This ensures compatibility with downstream geometric algorithms.

Changes:

• Replaced HashSet with LinkedHashSet or List + sorting to preserve order.
• Ensured deterministic CCW ordering starting from the bottom-most, left-most point.
• Updated test expectations to match the ordered output.

Impact:

• Algorithms like Rotating Calipers now compute correct values.
• Maintains correctness for all convex hull computations.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.65%. Comparing base (7e29be3) to head (0b40a35).

Files with missing lines	Patch %	Lines
...in/java/com/thealgorithms/geometry/ConvexHull.java	92.30%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6609      +/-   ##
============================================
- Coverage     75.68%   75.65%   -0.03%     
+ Complexity     5754     5738      -16     
============================================
  Files           699      699              
  Lines         19725    19697      -28     
  Branches       3826     3817       -9     
============================================
- Hits          14929    14902      -27     
+ Misses         4216     4215       -1     
  Partials        580      580              

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