Nebula Lint does not handle certain `@Retention(RetentionPolicy.SOURCE)` annotations correctly

Summary:

Nebula Lint should not warn of an unused dependency for @Retention(RetentionPolicy.SOURCE) annotations .

Steps to reproduce:

Create a gradle project and add the gradle lint plugin. Add project lombok. Create a class and annotate it with a lombok annotation. Run gradle lint and observe the warning.

Extended Description:

Project Lombok is an annotation processor that will generate getters/setters for your code at compile time. Take a look at their @Data annotation source:

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.SOURCE)
public @interface Data {
}

Here is an example class using that

@Data
public class SomeDataStruct {
  private Integer id;
  private String name;
}

Nebula lint gives the following warning:

> Task :lintGradle FAILED

This project contains lint violations. A complete listing of the violations follows. 
Because none were serious, the build's overall status was unaffected.

warning   unused-dependency                  this dependency is a service provider unused at compile time and can be moved to the runtime configuration

Workaround:

    gradleLint.ignore('unused-dependency') {
        compileOnly group: 'org.projectlombok', name: 'lombok', version:'1.16.20'
    }

Finally, thank you for making this plugin open source. I've found a lot of value in it.

nebula-plugins / gradle-lint-plugin