Merge pull request #2795 from TheBlueMatt/2023-11-robuster-chan-to-peer

 Move channel -> peer tracking to OutPoints from Channel IDs

diff --cc lightning/src/chain/channelmonitor.rs
Simple merge

diff --cc lightning/src/ln/channel.rs
Simple merge

diff --cc lightning/src/ln/channelmanager.rs
Simple merge

diff --cc lightning/src/ln/functional_test_utils.rs
Simple merge

diff --cc lightning/src/ln/functional_tests.rs
Simple merge