Allow to use both async-channel and futures channels via feature flags #48
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This PR addresses the compatibility issue: it is still impossible to use
async-channel
in Polkadot for some reasons. So far, we have no full understanding why does this happen but we want to be able to sync with the recent orchestra updates. With this change, it will be possible to select the concrete implementation of the underlying channels via features. Well, cargo features has proven to be a fragile and poor choice for it but it is complie time, so it has no cost on operations.This PR is stacked with #47