Implement volume calculation for ellipsoid

[kvadrik]

Added a method to calculate the volume of an ellipsoid.

• 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

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.47%. Comparing base (76c45c1) to head (8f886cc).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7338   +/-   ##
=========================================
  Coverage     79.46%   79.47%           
- Complexity     7081     7084    +3     
=========================================
  Files           790      790           
  Lines         23160    23161    +1     
  Branches       4556     4556           
=========================================
+ Hits          18404    18407    +3     
  Misses         4021     4021           
+ Partials        735      733    -2     

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