Prototype private property access in tst_qmltc_manual

In theory, private properties could be supported in the compilers
through the QMetaProperty. Since we already know each C++ property's
index (and QML properties cannot be private), we can use that index
for a fast-ish QMetaProperty lookup. QMetaProperty itself has read and
write methods, which should be sufficient for all the use cases:
* read a value
* write a value
* create a binding
In fact, binding creation on non-grouped private properties is already
supported (or almost supported) since bindings already rely on
QMetaProperty information.

As a downside, QMetaProperty (even without name lookup) is still an
overkill compared to
static_cast<ClassPrivate *>(QObjectPrivate::get(this)) and then calling
READ/WRITE/etc. of a property directly

Task-number: QTBUG-91956
Change-Id: If77d2783ac161cb9bdd0bd9d0b397fe88e9c471d
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

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