[VarExporter] Fix support for hooks and asymmetric visibility #59965
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It took me several days to figure out this patch 😓
This PR fixes support for hooks and asymmetric visibility, which add quite some complexity for lazy objects but also for the exporter/hydrator.
Note
Properties with a private "set" hook aren't supported and won't be in Symfony 6.4.
To support them, we'll need help from native lazy objects, and this is my next PR, but for branch 7.3.