Node :: SSE Port :: Phase 1

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• In Casper 2.0, the node continues to support an SSE server port.
• There is now a single event channel over which all events are published.
• The event set itself is fairly identical to 1.X.

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Scope:

• SSE client that binds to a node's SSE port
• Connection errors are handled.
• Event decoding -> event type, id & payload (payload is not deserialised)

A client should be able to:

• instantiate a struct encapsulating connection information.
• instantiate a client that will expose a simple function: await_events(event_type, predicate, callback)

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• Tests will be against an NCTL | CCTL | remote network.
• In CI/CD a test network will be span up and integration tests executed accordingly.