[input-output-hk/cardano-sl] [CBR-243] improve wallet worker start-up and exception handling (#3330)

Another though: `Chan`s (and `TQueue`s`, and `TChan`s and similar beasts) are bidirectional, so making them arguments to top-level functions is not particularly a good idea since one can’t rely on the types to reason about how a function will use it.

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