To POC the benefits of grouping collections the following needs to be accomplished:

• Add --groupCollections flag that is persisted in storage.bson
• Have WiredTigerKVEngine::createRecordStore be aware of --groupCollections and appropriately create/share tables.
• Store a prefix on each record store which is prepended to all document keys on cursor seeks.
• Appropriately bounds on cursors to stay within a collection's/index's set of documents