jooby-apt: should NOT generate metadata for defaults annotation attributes

[jknack]

Given:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Role {
  String value();

  String level() default "one";
}

With:

@GET
  @Path("/secure")
  @Role("User")
  public String secured() {
    return "OK!";
  }

The Role.level: one was accesible from filter:

String level = ctx.getRoute().attribute("Role.level");

This generate a lot of garbage making javac to fail/hung see #3525. Next release default values won't be generated any more so previous code must be replaced (when needed) with:

String level = (String) ctx.getRoute().getAttributes().getOrDefault("Role.level", "one");