Changes

[GUI] Add ConstraintAttachButtonSetting (#4601)

* Add ConstraintAttachButtonSetting to allow configuraiton of lagrangian based mouse interaction directly in the scene

* add example scene and remove alias

* Add comment to the class declaration in the header

* Added comment into the scene file

* Update Sofa/GUI/Component/src/sofa/gui/component/ConstraintAttachButtonSetting.h

Co-authored-by: Alex Bilger <alxbilger@users.noreply.github.com>

* Update Sofa/GUI/Component/src/sofa/gui/component/ConstraintAttachButtonSetting.cpp

Co-authored-by: Alex Bilger <alxbilger@users.noreply.github.com>

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Co-authored-by: Alex Bilger <alxbilger@users.noreply.github.com>
Co-authored-by: Frederick Roy <fredroy@users.noreply.github.com>