Fail when single region is accessed with multiple strategies

When we have two entities that share the same region but use different access strategies the Hibernate boot should fail. Right now there's an assertion in DomainDataRegionImpl.prepareFor* but this does not give much explanation and does not fail when assertions are disabled which leads to cryptic errors later on.

Example:

@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = "item")
public static class NonStrictReadWriteVersionedCacheableItem { ... }

@Cache(usage = CacheConcurrencyStrategy.READ_WRITE, region = "item")
public static class ReadWriteVersionedCacheableItem { ... }