New Feature: @Jacksonized @Accessors

[janrieke]

The PR adds a new feature for the existing @Jacksonized annotation. Up to now, @Jacksonized only affected @Builder or @SuperBuilder. With this PR, @Jacksonized can be used in combination with @Accessors(fluent=true).

Jackson identifies corresponding accessors following the beanspec conventions. If you use fluent accessors, Jackson does not make the connection between the field and the corresponding accessors, leading to strange behavior when de-/serializing. You can manually mitigate this by adding @JsonPropery("propertyName") annotations on the field, the setter and the getter (using @Getter/@Setter(onMethod_={@JsonPropery("propertyName")})). However, this is cumbersome and error-prone (because when renaming a field you also have to manually adjust all annotations).

With @Jacksonized @Accessors(fluent=true), lombok will automatically create the relevant annotations such that Jackson correctly identifies fluent accessors.

You can simply write classes like this:

@Jacksonized @Accessors(fluent = true)
@Getter @Setter
public class MyDTO {
	private int field;
}

Lombok will generate fluent getters and setters with the required Jackson annotations, such that this class can be de-/serialized by Jackson without further modifications.

This resolves #3265, #3270.
Related issue: #2141

Further changes:
Together with this new feature, this PR changes a lombok behavior that has caused some issues since its introduction in v1.18.16. With that version, lombok started automatically copying certain Jackson annotations to the setter. However, this behavior cannot be switched off, and it may even be harmful in certain situations (e.g. #3769, #2769, #3263): Jackson considers some annotations inheritable, and this "virtual inheritance" only affects annotations on setter/getter, but not on private fields. Automatically copying annotations therefore may change the de-/serialization behavior of subclasses.

In general, it is not necessary to copy those annotations at all: Jackson considers the Java field and the corresponding setter and getter methods to be connected (given that Jackson can "beanspec"-identify the connection), and it is sufficient for an annotation to be present on one of those to become effective for all. Thus, the new default behavior with this PR is not to copy, but you can switch back to the previous behavior using lombok.copyJacksonAnnotationsToAccessors = true.

[rzwitserloot]

Awesome work. Nothing of note during review; just used it as a springboard to make a couple of style things more consistent.