Handle @PersistenceContext in reflection metadata

[snicoll]

Consider the following:

https://github.com/spring-projects-experimental/spring-native/blob/76da6837d0a9db3d009b634c739ffb1700e65f11/samples/hibernate/src/main/java/app/main/SampleApplication.java#L22-L29

On the JVM (with AOT) the field is injected because the jvm sees the PersistenceContext annotation. It does not on native because no reflection config exists for it. We could fix this by adding a dedicated class that scans and add the reflection metadata. We don't really have an SPI around this now so it would be worth creating one.

[sdeleuze]

This is currently handled by PersistentContextMarkedComponentProcessor and migrating this should be part of the wider effort to port ComponentProcessor to the new AOT engine, so moving it to 0.11.x.

[snicoll]

I believe this one is now a duplicate of #1297. Please reopen if I have misunderstood.