Ability to use JsonAnyGetter on fields (#177)

Co-authored-by: Dominik <dominik@home>

src/main/java/com/fasterxml/jackson/annotation/JsonAnyGetter.java

@@ -19,7 +19,7 @@
  * with this annotation; if multiple methods are annotated, an exception
  * may be thrown.
  */
-@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD})
+@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD, ElementType.FIELD})
 @Retention(RetentionPolicy.RUNTIME)
 @JacksonAnnotation
 public @interface JsonAnyGetter