fourier 3D with tests

[mohd-afeef-badri]

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[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.76%. Comparing base (671c720) to head (bb218a8).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
modules/fourier/FemModule.cc	90.90%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
+ Coverage   74.57%   74.76%   +0.18%     
==========================================
  Files          66       66              
  Lines       10167    10199      +32     
  Branches     1197     1202       +5     
==========================================
+ Hits         7582     7625      +43     
+ Misses       2216     2205      -11     
  Partials      369      369              

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