RAS22 — add assetVersion attribute to RelatedAsset

Currently the RelatedAsset class/element only contains the id of the related asset. This is fine if the related asset relationship type is aggregation because the related asset has a reference to the actual artifact that represents the asset. We need to support loosely coupled asset relationships where you don't have a direct reference to the related asset but instead some rules of where to search for it. In this scenario, we need more information to uniquely identify the asset. Specifically...we need the version of the related asset. We'd like to add an assetVersion attribute to the RelatedAsset element to match the assetId attribute that already exists. We think this provide us the information we would need for this loose coupling.

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