CMake: Allow building pure QML modules not backed by C++ sources

When no C++ sources are passed to qt_internal_add_qml_plugin (a pure
QML module), create a C++ backed Qt plugin anyway.

In such a case, generate a dummy plugin.cpp containing a
QQmlEngineExtensionPlugin subclass.

The class name is autogenerated from the QML import URI.
The class constructor will call the qmltyperegistrar generated
void qml_register_types_foo() function, to ensure the needed module
versions are registered for the QML module.

Change-Id: I19959dafdf0dc837c6037e7dc1d549b7420110a7
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

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