Since SF has deprecated `StandardAnnotationMetadata` ctors in favor
of factory method, we can't extend it any more to adapt annotation
attributed by the map generated from the XML attributes
* Introduce an `AnnotationMetadataAdapter` to request a
`getAnnotationAttributes()` implementation which is only a method used
in the target `registerBeanDefinitions()` implementations
* Use a new `AnnotationMetadataAdapter` whenever the `StandardAnnotationMetadata`
has been used before
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