Add support for EntityManagerFactory bootstrapping from JPA 3.2 PersistenceConfiguration

[jhoeller]

Following up on #35622, JPA 3.2 also comes with jakarta.persistence.PersistenceConfiguration for standalone bootstrapping. We can fully support this in LocalEntityManagerFactoryBean which gains much richer standalone bootstrap options that way. Additionally, we can also support it in LocalContainerEntityManagerFactoryBean and DefaultPersistenceUnitManager for merging PersistenceConfiguration-specified settings into a Spring-managed PersistenceUnitInfo.