Support the use of @CollectionId on bag-based element collections in audit entity mappings.

Presently, if a user wishes to map an element collection in Envers and have it audited, they must either map such a collection by either specifying an order/index column

or by explicitly using a Set container rather than a bag-semantic based container:

Another alternative that Hibernate supports is the use of @CollectionId and we should look into adding support for that custom annotation.