HSEARCH-1727 Restore original package name for SearchFactory, break inhe...

...ritance link with SearchFactoryIntegrator

https://hibernate.atlassian.net/browse/HSEARCH-1727
I don't think you can use `SearchFactory` here. `SearchFactory` is now an interface of the orm module. Is it not up to the integrator to decide what it exposes? The `SearchFactory` just is "just" the integration as defined by the orm integration/module