Added surface area of a cuboid

[kvadrik]

Added surface area of a cuboid according to the formula: S = 2 * (ab + ac + bc)

• 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 79.40%. Comparing base (0d2a98e) to head (7b653b9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7293      +/-   ##
============================================
- Coverage     79.41%   79.40%   -0.02%     
- Complexity     7051     7053       +2     
============================================
  Files           787      787              
  Lines         23107    23114       +7     
  Branches       4542     4544       +2     
============================================
+ Hits          18351    18354       +3     
- Misses         4023     4024       +1     
- Partials        733      736       +3     

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