[BUGS-0.2.0] Default data backend

[fnikolai]

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I 'm trying to run superduper without any configuration, but it fails:

2024-May-17 00:16:19.96| ERROR    | 8caba5037a98| superduperdb.base.build:72   | Error initializing to DataBackend Client: localhost:27017: [Errno 111] Connection refused (configured timeouts: socketTimeoutMS: 20000.0ms, connectTimeoutMS: 20000.0ms), Timeout: 5.0s, Topology Description: <TopologyDescription id: 6646a1ceb8de3de22757623b, topology_type: Unknown, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('localhost:27017: [Errno 111] Connection refused (configured timeouts: socketTimeoutMS: 20000.0ms, connectTimeoutMS: 20000.0ms)')>]>

The problem is that is trying to connect to a local mongo database. Why don't we have the mongomock as default ?