Add methods and change method access for Hibernate Reactive

[dreab8]

Changes needed to fix hibernate/hibernate-reactive#1770
see hibernate/hibernate-reactive#2513

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[beikov]

Since you're overriding AbstractEntityPersister, wouldn't it be better/easier to just throw a better error from your subclass in the initializeEnhancedEntityUsedAsProxy method?

[dreab8]

Hi @beikov , Reactive Stage#fetch() method uses initializeEnhancedEntityUsedAsProxy to initialize the entity attributes.

In Reactive we have to prevent calling this method directly from the LazyAttributeLoadingInterceptor and EnhancementAsProxyLazinessInterceptor so what you suggest unfortunately doesn't work.