Add chain_id to UTXO coins #1451

After GLEECBTC/komodo-defi-framework#2499, we now have to have chain_id field for UTXO coins that we wish to support via WalletConnect.

That chain_id is a string that begins with "bip122:" for all UTXO coins and represents the bip122 chain of this coin. You can read more about that here: https://github.com/ChainAgnostic/CAIPs/blob/main/CAIPs/caip-4.md