Support for registering reference types (when they can't be inferred)

[pjfanning]

• current code can't handle deserialization for case class OptionLong(valueLong: Option[Long])
  • type erasure of scala.Long (an alias for the java long primitive) causes this
• You can use java.lang.Long, scala.BigInt or other reference types with no issue
• You can use Jackson JsonDeserialize annotation to annotate the valueLong field
• This new support is experimental and you should prefer the existing workarounds
• ScalaAnnotationIntrospector.registerReferencedType(clazz: Class[_], fieldName: String, referencedType: Class[_]) is the main API for this change
  • in the OptionLong example: ScalaAnnotationIntrospector.registerReferencedValueType(classOf[OptionLong], "valueLong", classOf[Long])

[pjfanning]

@Mergifyio rebase