Add CCPACSSkin to Python bindings

[joergbrech]

Fixes #1037

Description

This PR adds the missing#include and %include statements to the swig interface file configuration.i.

How Has This Been Tested?

Screenshots, that help to understand the changes(if applicable):

Not applicable.

Checklist:

Task	Finished	Reviewer Approved
At least one test for the new functionality was added.	yes does not apply	OK
New classes have been added to the Python interface.	yes does not apply	OK
The code is properly documented with doxygen docstrings	yes does not apply	OK
Changes are documented at the top of ChangeLog.md	yes does not apply	OK

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.88%. Comparing base (6d414b0) to head (fc5b873).

Files with missing lines	Patch %	Lines
src/fuselage/CTiglStringerFrameBorderedObject.cpp	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1041      +/-   ##
==========================================
- Coverage   69.91%   69.88%   -0.03%     
==========================================
  Files         294      294              
  Lines       27288    27299      +11     
==========================================
  Hits        19078    19078              
- Misses       8210     8221      +11     

Flag	Coverage Δ
unittests	69.88% <0.00%> (-0.03%)	⬇️

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Files with missing lines	Coverage Δ
src/fuselage/CTiglStringerFrameBorderedObject.cpp	0.00% <0.00%> (ø)

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[merakulix]

Short update: CCPACSkin is available now via Python Bindings, CPACSSkinSegments as well. I also tested some of the getter functions of boost::optional types in CCPACSFuselageStructure, such as stringers, frames, cargo_cross_beams, cargo_cross_beam_struts, which are also available now. As discussed with @joergbrech, see RISCSoftware/cpacs_tigl_gen#59 about the getter functions for the vector elements