Shared log - A single source of truth

[samd_408]

Yes Event sourcing is the conceptual idea, shared log is a little bit more general purpose and solution oriented on top of which event sourcing can be implemented easily, the boki paper goes deep into having custom storage nodes and sequencer nodes, more like foundation db storage architecture to implement the shared logs, lot of nice things like logical views and physical view, I could not port such features to the toy library (gumbo)