[jira] [Created] (FLINK-20268) Update Python SDK to implement new invocation protocol

["Tzu-Li (Gordon) Tai (Jira)" <ji...@apache.org>]

Tzu-Li (Gordon) Tai created FLINK-20268:
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             Summary: Update Python SDK to implement new invocation protocol
                 Key: FLINK-20268
                 URL: https://issues.apache.org/jira/browse/FLINK-20268
             Project: Flink
          Issue Type: Sub-task
          Components: Stateful Functions
            Reporter: Tzu-Li (Gordon) Tai
             Fix For: statefun-2.3.0


The Python SDK should be updated to implement the new protocol introduced by FLINK-20265.

Users should be able to declare states the Python function uses, and with information, the Python SDK {{RequestReplyHandler}} can then match on the provided states values in invocation requests against the declared states of a target function:

Proposed API:
{code}
@functions.bind(
    typename="example/greeter",
    states=[StateSpec("seen_count")])
def greet(context, greet_request: GreetRequest):
    state = context.state("seen_count").unpack(SeenCount)
    ...
{code}



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