Use QML_EXTENDED to "inherit" QPdfDocument props, enums and signals

In QML we want to treat the status values like Error and Ready as if the
enum were declared in QQuickPdfDocument, even though it's really from
the non-QML type QPdfDocument.  This is needed because QQuickPdfDocument
doesn't inherit QPdfDocument (9968e2578f96081d2a242340620fcb2b96d9a1d3
could've done direct inheritance, but we sometimes value separation of
QML API from C++ API).

So we now de-duplicate other properties and signals too. It's as if from
QML's perspective, PdfDocument inherits everything from QPdfDocument
(including the properties pageCount, password and status), although in
C++ it's not like that.

Make all properties FINAL because we don't expect anybody to subclass
QQuickPdfDocument.

Fixes: QTBUG-100839
Change-Id: Idbb0d620443020d7168cba8f090d1f344a9b3296
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

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