[FEATURE] Add configuration key lombok.copyableAnnotations.onMethod and/or add swagger's @Hidden to the list of COPY_TO_SETTER_ANNOTATIONS

[dstango]

Describe the feature
It would be nice to have an option to not only copy attribute annotations to setter-parameters via config, but also be able to copy them on the setter-method.

Here's my use case:
While defining an openapi-spec with swagger (io.swagger.core.v3:swagger-jaxrs2) I wanted to use the magic of @Data (I boiled it down to @Setter for the issue) and copyable annotations:

Example class:

@Setter
public class Foo {
	@Hidden
	private int bar;
}

lombok.config:

lombok.copyableAnnotations += io.swagger.v3.oas.annotations.Hidden

I got the (for me) mysterious error message The annotation @Hidden is disallowed for this location.

After lots of head scratching I found out lombok produced something like this out of it:

public class Foo {
	@Hidden
	private int bar;

        public void setBar(@Hidden int bar) {
            this.bar = bar;
        }
}

Turned out annotations on setters are always copied to the corresponding parameter, not on the setter-method.

Yet @Hidden specifies the following target:

@Target({METHOD, TYPE, FIELD, ANNOTATION_TYPE})

Reviewing the documentation of lombok.copyableAnnotations I find:

Lombok will copy any of these annotations from the field to the setter parameter, ...

So the behavior is as intended, yet kept me somewhat helpless.

I found a workaround, it's putting

@Setter(onMethod_ = {@Hidden})

on every field, which makes my original @Data annotation on the class redundant for setters.

I found an older issue that addresses this behavior in regards to builders: #1961.
This issue was resolved by hardcoding the special case @JsonProperty.

While I'd favor a general configuration solution like having a setting:

lombok.copyableAnnotations.onMethod += io.swagger.v3.oas.annotations.Hidden

which would result in:

public class Foo {
	@Hidden
	private int bar;

        @Hidden
        public void setBar(int bar) {
            this.bar = bar;
        }
}

an easier solution would be to add swagger's @io.swagger.v3.oas.annotations.Hidden to the list HandlerUtil.COPY_TO_SETTER_ANNOTATIONS, that already contains Json-properties, that seem to behave similarly.

Describe the target audience
Everyone that wants to use @Data or @Setter a lot with annotations that can only be put on a method level.

Additional context
This issue might be related: #3595

If the team lombok would choose to put the annotation to the COPY_TO_SETTER_ANNOTATIONS-list, I could provide a list of all swagger annotations that might fall into the same category (and of course provide a PR with this list).

Thanks for considering!