PMP: Add visitors for polygon_soup_to_polygon_mesh()

[MaelRL]

Summary of Changes

Adds a visitor to two functions so that it easier to keep attributes between points and vertices.

PR status: waiting for feedback on API (from @lrineau) after these new functionalities been used.

TODO:

• Double check visitor references
• Node visitor reference (intersections_impl.h)?
• Visitor concept
• small feature

Release Management

• Affected package(s): Polygon_mesh_processing
• Feature/Small Feature (if any): TODO
• Link to compiled documentation (obligatory for small feature) TODO
• License and copyright ownership: No changes.

[MaelRL]

@lrineau would the current API work for you?

• visitor for orient_PS: https://github.com/CGAL/cgal/pull/4856/files#diff-a5e5139ac53d731e4ccc86e54dc5735aR36
• visitor for ps_to_pm: https://github.com/CGAL/cgal/pull/4856/files#diff-c7bcbf9acbb5f991bfde9925e1e51dd0R41

[lrineau]

Missing doc

None of the two visitor concepts are documented.

Lightweight copyconstructible visitors?

In the BGL, all the visitors concepts start with:

Refinement of: Copy Constructible (copying a visitor should be a lightweight operation).

The BGL convention is to pass visitor parameters by copy.

It seems the PMP convention is actually non-documented by visitors are passed by non-const references. We should decide what to use and how to document that convention.

[MaelRL]

#5461 reimplemented the main work of this PR, but using named parameters instead.