Introduce support for finding repeatable annotations on repeatable annotations

[sbrannen]

Overview

The current search algorithm for repeatable annotations does not find repeatable annotations if they are used as meta-annotations on other repeatable annotations. However, as a prerequisite for #1793, we need to be able to find such repeatable annotations.

Deliverables

• Update the search algorithm in AnnotationUtils.findRepeatableAnnotations() to find repeatable annotations on repeatable annotations.
• Document this new feature in the Release Notes.

[sbrannen]

in progress