Use AnnotationIntrospector.findRenameByField() to support "is properties"

[cowtowncoder]

So, while #80 was resolved in 2.10.1, implementation can be inefficient and may not work as cleanly with core Jackson property handling as it ideally should. Now that Jackson 2.11 adds direct extension point to support Kotlin use case:

FasterXML/jackson-databind#2527

let's use it for implementation.