HHH-7998 - Add TypeContributions contract

Conflicts:
	hibernate-core/src/main/java/org/hibernate/dialect/Dialect.java
	hibernate-core/src/main/java/org/hibernate/metamodel/internal/MetadataImpl.java
	hibernate-core/src/main/java/org/hibernate/metamodel/spi/TypeContributor.java
HHH-7995 Added support for TypeContributors in OSGi.  Integrated with
envers
Conflicts:
	hibernate-core/src/main/java/org/hibernate/cfg/Configuration.java
	hibernate-entitymanager/src/main/java/org/hibernate/ejb/Ejb3Configuration.java
	hibernate-osgi/src/main/java/org/hibernate/osgi/OsgiPersistenceProvider.java
	hibernate-osgi/src/main/java/org/hibernate/osgi/OsgiSessionFactoryService.java
HHH-7944 envers classloader issues
Conflicts:
	hibernate-envers/src/main/java/org/hibernate/envers/configuration/spi/AuditConfiguration.java