Adding /FCLEAN implementation

[germa89]

Closes #1606

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[germa89]

Requesting @clatapie to review this PR.

This is a classic example on how to add a new MAPDL function to PyMAPDL. As you see it is very simple procedure.

Just need to add the function to the correspondent python file. You can find out by checking the APDL command reference guide:

If you see this command is categorized as Session > Files (see yellow highlight), so we look for this file in the repo and it is here pymapdl/src/ansys/mapdl/core/_commands/session/files.py.

Then you just need to copy the body of the command description and adapt it to the RST requirements. Including any parameter (in this case there is none), outputs (none again), etc.
More details about the format of this docstring can be find in: https://numpydoc.readthedocs.io/en/latest/format.html
And an example in: https://numpydoc.readthedocs.io/en/latest/example.html

[codecov]

Codecov Report

Merging #1633 (b88cea7) into main (fb5fb8b) will increase coverage by 3.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1633      +/-   ##
==========================================
+ Coverage   79.51%   82.81%   +3.30%     
==========================================
  Files          44       44              
  Lines        7151     7151              
==========================================
+ Hits         5686     5922     +236     
+ Misses       1465     1229     -236     

[germa89]

Pinging @maromer0 for learning purposes.

This is a classic (and very simple) example on how to write docstrings for later being able to be rendered by Sphinx. Please have a look.

[clatapie]

I took notes of this example, thank you @germa89 !