Small step towards implementation of HHH-1907: converting these components into an Hibernate Service we can configure them independently in each SessionFactory, and override components via the ServiceRegistry.

In particular for Quarkus, we need to be able to inject a ProxyFactoryFactory by instance. See also:

• https://github.com/quarkusio/quarkus/issues/6063
• https://hibernate.atlassian.net/browse/HHH-13804