Added surface area calculation for pyramid

[KadenR789]

• 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

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 73.41%. Comparing base (03bb8ee) to head (1af8bba).

Files with missing lines	Patch %	Lines
src/main/java/com/thealgorithms/maths/Area.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6070      +/-   ##
============================================
- Coverage     73.42%   73.41%   -0.02%     
  Complexity     5078     5078              
============================================
  Files           656      656              
  Lines         17617    17624       +7     
  Branches       3394     3395       +1     
============================================
+ Hits          12936    12938       +2     
- Misses         4180     4186       +6     
+ Partials        501      500       -1     

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[siriak]

Please fix PR checks and add JUnit tests