Describe the PR

This fixes a potential false negative when@Getter is used. See discussion on#4474:

I think that a field (or class) being annotated with the@Getter annotation should not be a > reason to exempt from the ImmutableField rule. After all, it only generates a getter, meaning > the field can still be marked final.

Originally posted by@PimvanderLoos in#4474 (comment)

Ready?

• Added unit tests for fixed bug/feature
• Passing all unit tests
• Complete build./mvnw clean verify passes (checked automatically by github actions)
• Added (in-code) documentation (if needed)