fix: prevent ImportAnnotationVisitor walking non-visible classes #540
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The ImportAnnotationVisitor would walk the spring hierarchy and cause package-private classes to have definitions created for them.
This would then fail at runtime, as Micronaut could not access these defined beans.
This fix only visits public classes to prevent this problem.
Closes #521
Added @dstepanov and @graemerocher as reviewers as although this fixes the issue, I'm not 100% sure on my understanding of the mechanisms at play here