Refactoring RANS mesh generation

[GBenedett]

Change the RANS mesh generation and add different options for refinement to get a good mesh.

[codecov]

Codecov Report

Attention: Patch coverage is 7.61421% with 364 lines in your changes missing coverage. Please review.

Project coverage is 54.02%. Comparing base (3934fa4) to head (7041587).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ceasiompy/CPACS2GMSH/func/rans_mesh_generator.py	3.70%	260 Missing ⚠️
ceasiompy/CPACS2GMSH/func/advancemeshing.py	5.66%	100 Missing ⚠️
ceasiompy/CPACS2GMSH/cpacs2gmsh.py	0.00%	2 Missing ⚠️
ceasiompy/utils/ceasiompyutils.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
- Coverage   55.57%   54.02%   -1.56%     
==========================================
  Files         140      140              
  Lines       11357    11680     +323     
==========================================
- Hits         6312     6310       -2     
- Misses       5045     5370     +325     

Flag	Coverage Δ
integrationtests	33.42% <7.61%> (-1.00%)	⬇️
unittests	45.95% <15.32%> (-0.56%)	⬇️

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