display scalar values in MeshViewer

[kerautret]

PR Description

This PR add ew options to display scalar values on mesh faces (--scalar, --scalarRange, --scalarColumns) using polyscope colormap.
It allows to display directly quantity from the range : ./visualisation/meshViewer mesh.off --faceScalar file.dat --scalarColIndex 0 2 --scalarRange 0 50

Checklist

• Doxygen documentation of the code completed (classes, methods, types, members...).
• Main tool doxygen documentation (following existing documentation of DGtalTools documentation.
• Check if it follows the tools structure described in CONTRIBUTING.md
• New entry in the ChangeLog.md added.
• Update the readme with potentially a screenshot of the tools if it applies.
• No warning raised in Debug cmake mode (otherwise, Github Actions C.I. will fail).
• All continuous integration tests pass (Github Actions).