Move `InflightHtlcs` and `Router` trait into `ChannelManager`#1811

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

valentinewallace:2022-10-chanman-routervalentinewallace/rust-lightning:2022-10-chanman-routerCopy head branch name to clipboard