Represents type projection used in a type argument of the type based on a class or on a type alias. For example, in MutableMap<in String?, *>, in String? is the type projection which is the first type argument of the type.
MutableMap<in String?, *>
Contains default instance for star projection: KmTypeProjection.STAR.
the projected type, or null if this is a star projection
the variance of the type projection, or null if this is a star projection