Utility to ask peers to force-close given a bag of `ChannelMonitor`s

[TheBlueMatt]

This is a "rich man's SCB" - letting you do an SCB with at least some data that might well be the latest data. This avoids at least part of the issue with SCBs - that your peer knows they should just cheat cause you aren't gonna punish them - while still accomplishing a similar goal - letting you get the latest state broadcasted without necessarily having the latest state.

Of course this is still substantially less ideal than using VSS, so we'll want to have a motivating use-case in mind, I think.

[TheBlueMatt]

We should probably also only do this if we have peer-state-storage in the spec, that way we're even more protected by ensuring we have the latest state if any one of our peers is honest.