refactor: reintroduce generic substream in client rpc #3390
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Description
Generic substream was removed in order to more closely test RPC/yamux
interaction but that was incorrect. The tests should have just been
updated without removing the generic + add new StreamId abstraction.
This PR reintroduces them so that an RPC client mock can more easily be created.
Motivation and Context
How Has This Been Tested?
Existing tests pass