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0c74575c44
This commit restructures the initialization procedure for chain watchers such that they can proceed in parallel. This is primarily to help nodes running with the neutrino backend, which otherwise forces a serial rescan for each active channel to check for spentness. Doing so allows the rescans to take advantage of batch scheduling in registering for the spend notifications, ensuring that only one or two passes are made, as opposed to one for each channel. Lastly, this commit ensures that the chain arb is properly shutdown if any of it's chain watchers or channel arbs fails to start, so as to cancel their goroutines before exiting.