DATACMNS-485 - Fixed false negative type alias detection in MappingContextTypeInformationMapper.

MappingContextTypeInformationMapper now considers the raw type only for type alias conflict detection.
DATACMNS-485 - API improvements to in TypeInformationMapper area.

The default implementations of the TypeInformation Mapper interfaces now work with ClassTypeInformation where possible to express they only map raw types effectively.

Added TypeInformation.getRawTypeInformation() to easily turn whatever TypeInformation into the raw type representation. Changed ClassTypeInformation.from(…) to return ClassTypeInformations directly.