2 new classes in studio.ui : nativeTabFolderWidget and
NativeTabFolderItem

Depending on the OS, thoses create TabFolder & TabItem (mac and linux)
or CTabFolder (windows)
& CTabItem

-> TabFolder and TabItem have a nice rendering on mac and linux, but a
bad one on windows. It is the opposit for CTabItem and CTabFolder
-> Those two classes ensure that the best rendering is always use, with
the same behavior

Use CTab folders / items on macos since TabFolder are natively broken
since the macos update. This way, we ensure that the behavior is the
same no matter the macos version. The rendering is still nice thanks to
the custom css rules on CTabFolders.

[STUDIO-3703](https://bonitasoft.atlassian.net/browse/STUDIO-3703)