Virtual keyboard builtin styles are not translated into code (for historical reasons)

As part of effort to port virtual keyboard to declarative type registrations, virtual keyboard style resources were relocated from virtualkeyboard module to the new QtQuick.VirtualKeyboard.Styles.Builtin.* modules.

Normally, all the QML code within a QML module is compiled, but since legacy reasons, this will not be the case with the virtual keyboard styles. This is because the styles are loaded by using the Loader component at runtime, based on the setting provided by the user application.