feat: Tokio mem channel #131
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This should make using tokio mpsc channel easier.
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This is a new attempt to do a mem transport based on
tokio::sync::mpsc::channel, replacing #86The big problem of the former PR is that the listener is Clone, so there needs to be some ugly stuff to turn the tokio mpsc channel into a mpmc channel.
So this PR is an experiment to change Listener to be non-Clone and also take a &mut self in accept. Once you do that, implementing a mem channel using a mpsc channel becomes much easier.
I have tried this out in a crate, iroh-blobs, that uses rpc in a pretty complex way, and have not found an issue adapting this. Being able to clone the place that does accept is a bit weird anyway, but I did it because both my favoured memory channel at the time (flume) and the networked channel (quinn) did support it.