Add file backend for state sessions #574
Merged
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This change also adds a new dependency with msgpack. For now we use it to serialize/deserialize the JSON strings of the Mesop state. In the future we will want to serialize everything with msgpack.
The reason we can't do this now is because we will need to add msgpack encoding/decoding rules to support non-standard data types.
This change also adds a new config variable called MESOP_STATE_SESSION_BACKEND_FILE_BASE_DIR which allows the user to specify the location where the state sessions get written.
Ref #556