mesh_channel: hide RPC response receiver from callers #449
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In the future, RPC channels will typically (always?) use blocking senders to provide backpressure and better support early cancellation.
To prepare for this, wrap the RPC response oneshot channel in a separate type which in the future can contain both a blocking send request and the response receiver.
Also, hide the internal fields of
Rpc
to give us flexibility there in the future, too.