Describe the Request

The Publisher/Subscriber interfaces in proxystore.pubsub are just shims around existing pub/sub interfaces. I think it would be more clear to have these shims be a subpackage of proxystore.stream as they are tightly coupled with each other.

This will require making proxystore.stream a subpackage rather than submodule which I think will be good in the long term as we add more features.

Sample Code

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