Support uint256 transfer amount

[colin-axner]

Crate

relayer-cli, v0.7.0

Summary

When attempting to transfer an amount of 2^64, an error is returned. I am testing a change in ibc-go which increases the allowed transfer amount from uint64 to uint256

Problem Definition

hermes  tx raw ft-transfer network1 network2 transfer channel-0 18446744073709551616 -d samoleans -t 180
error: invalid argument to option `amount`: number too large to fit in target type

Do the proto files need to be regenerated?

Proposal

Support up to uint256 transfer amounts

Acceptance Criteria

ft-transfer works with uint256 amounts

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