Added surface area calculation for pyramid

[Abdi-Ahmed-Bare]

This pull request adds a new method surfaceAreaPyramid in Area.java that calculates the surface area of a pyramid with a square base.
The method validates inputs and returns the total surface area as the sum of the base and lateral areas.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.95%. Comparing base (8930369) to head (4c5d65e).

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    #6901      +/-   ##
============================================
- Coverage     78.00%   77.95%   -0.05%     
+ Complexity     6444     6443       -1     
============================================
  Files           737      737              
  Lines         21519    21526       +7     
  Branches       4208     4209       +1     
============================================
- Hits          16785    16781       -4     
- Misses         4062     4071       +9     
- Partials        672      674       +2     

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[Abdi-Ahmed-Bare]

this is a perfect method for Surface Area of Pyramids