Collection Members are not included in the version

Step to reproduce:

• Create a Collection
• Add 2 documents to this collection
• Version the Collection (v1)
• Add a third document to the collection
• Version the Collection (v2)
• Restore the version v1 of the Collection

The Collection Members are the the ones from v2.

Fixing this bug involves asynchronous worker which will also update the documents members of the collection before and after the restoration of the revision.