Implement option_simple_close
#597
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The spec allows the closer to use an OP_RETURN output if their amount is too low when using `option_simple_close`.
We update the `Negotiating` state to exchange the `closing_complete` and `closing_sig` messages, and allow RBF-ing previous transactions and updating our closing script. We stay in that state until one of the transactions confirms, or a force close is detected. This is important to ensure we're able to correctly reconnect and negotiate RBF candidates.
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Implement
option_simple_closeas defined in lightning/bolts#1096This is a pre-requisite for taproot channels.