Hermes token transfer CLI should permit custom destination address

[adizere]

Crate

ibc-relayer and -cli

Summary

This is a sub-issue of #628

For ft-transfer, allow the supplied destination "address" to optionally be an arbitrary string. On the Agoric chain, where our bech32 prefix is "agoric", the transfer destinations are in their own namespace and look something like "board:1938586739".

Acceptance Criteria

• the ft-transfer command permits an additional parameter that is optional, specifying which receiver address to use, e.g.:

hermes tx raw ft-transfer ibc-0 ibc-1 transfer channel-2 9999 1000 -n 1 -r board:1938586739

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