Extract AnnotatedElementAdapter to public type #34628
Description
We currently have two private implementations that adapt an array of annotations to an AnnotatedElement: AnnotatedElementUtils.AnnotatedElementForAnnotations and TypeDescriptor.AnnotatedElementAdapter.
The latter has been optimized over the years; whereas, the former has not.
Since there is not much point in keeping both implementations, we should extract AnnotatedElementAdapter to a public type and get rid of AnnotatedElementForAnnotations.