Added surface area calculation for pyramid

[Leosly7663]

I have updated the math functions to include the ability to calculate the area of a pyramid shape

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.24%. Comparing base (21eff8a) to head (0195577).

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    #6970      +/-   ##
============================================
- Coverage     78.26%   78.24%   -0.03%     
- Complexity     6573     6574       +1     
============================================
  Files           743      743              
  Lines         21895    21902       +7     
  Branches       4288     4289       +1     
============================================
+ Hits          17137    17138       +1     
- Misses         4074     4081       +7     
+ Partials        684      683       -1     

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