Add ConvexHullTest.java for convex hull algorithm testing

[MedhaSunkad13]

• 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 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.48%. Comparing base (b316dcf) to head (fbf09cf).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/com/thealgorithms/geometry/ConvexHullTest.java	0.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6790      +/-   ##
============================================
+ Coverage     77.46%   77.48%   +0.02%     
- Complexity     6257     6293      +36     
============================================
  Files           725      729       +4     
  Lines         20894    20990      +96     
  Branches       4071     4089      +18     
============================================
+ Hits          16185    16265      +80     
- Misses         4075     4090      +15     
- Partials        634      635       +1     

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