Add TypeDetails#determineRawClass

[sebersole]

Add a method to determine the raw ClassDetails from a TypeDetails:

interface TypeDetails {
    ...

    /**
     * Determine the raw {@linkplain ClassDetails class} for the given type.  Never returns {@code null}, opting 
     * to return {@linkplain ClassDetails#OBJECT_CLASS_DETAILS Object} instead if the raw class is not known
     * 
     * @return The raw class details, or {@linkplain ClassDetails#OBJECT_CLASS_DETAILS Object} if "not known".
     * 
     * @see TypeDetailsHelper#resolveRawClass
     */
    default ClassDetails determineRawClass() {
        return TypeDetailsHelper.resolveRawClass( this, null );
    }
}