Peartobear

Pay invoice via a specific route if chan_id is specified

2

Letting Boltz construct a route via a specified channel when the channel id is specified would allow for creation of more custom channel opening and normal submarine swaps.

Current bot-message ``` [mainnet]: Swap failed: onchain HTLC timed out ID: rkwzqr Pair: LTC/BTC Order side: sell Lightning amount: 0.00187779 BTC Invoice: lnbc1877790n1pwa9qzzpp584at9nc5f5c2ydnlrg25yq6dx5w8600tpg4vm0xw7hssldg3fazqdqqcqzpgxqrrss4dzfyc2lzyys2tzdmx6efqw58n9fmyznjxzcpsk5vxp73w7qtekrj8trqglqq8ew3uajhx6n27g03qmmh822eh4phvx5xthg0j2r9wqq3yfgaa ``` Desired rectification: `[mainnet]: Swap failed: onchain...