Setup Support for delaying `ChannelMonitorUpdate` flight until an `Event` completes#2111

TheBlueMatt merged 4 commits intolightningdevkit:mainlightningdevkit/rust-lightning:mainfrom

TheBlueMatt:2023-03-sent-persist-order-prepTheBlueMatt/rust-lightning:2023-03-sent-persist-order-prepCopy head branch name to clipboard