DatabaseImpl::init currently loads the views after the CollectionCatalog is available to access the <db>.system.views collections.

Now that we've associated the view catalog with the collection catalog, we should change view loading to when the CollectionCatalog loads.

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The tricky part of this may be how to identify where to find the views, since the particular <db>.system.views namespaces need to be identified first, and I don't believe we track databases in the CollectionCatalog. So we would likely have to track database names as we load Collections, and then check the databases for existing <db>.system.views collections.

Additionally, the DurableViewCatalog dependency on the Database needs to be removed: right now DurableViewCatalog holds an internal Database*, which is only accessed to get the db name and system.views collection namespace. This should be easily remedied.