chantools: recoverloopout

[hieblmi]

This PR adds a new loop recovery command, recoverloopout.

If the client daemon fails to sweep a loop-out output, recoverloopout can sweep it manually.

Example

chantools recoverloopout --txid 6ab65a959d26a89de972a3812f5c372b10247321c291f72d9ba33950dbe0f8ca --vout 1 --swap_hash e2024fb3b60ec6e34dcb564c6ca0bedaa84e4088995248ab9d340dcf657dfe32  --feerate 10 --current_block_height 728 --output_amt 290000 --loop_db_dir /path/to/loopdir --sweepaddr bcrt1pyk4kfjlkh43j6qewpnlr6f4fc0aghgxspcxxn7pph2c3kq3hjvxsj59tur