Add isParentFirst method to QuarkusClassLoader

[geoand]

This can be used by extensions to determine if a class
would be loaded parent first or not.
Relates to: #16576 (comment)

cc @mkouba

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[geoand]

Rebased onto main now that continuous testing is in

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[mkouba]

Looks good. So for evey class that would be normally transformed to workaround a proxy limitation we'll check (only in the dev mode) whether QuarkusClassLoader#isParentFirst() returns false, otherwise we will fail the build...

[geoand]

@stuartwdouglas is this good with you?