Add ability to send transfer packets from the CLI for testing purposes

[ancazamfir]

Crate

relayer-cli and relayer

Summary

Add a CLI to send transfer packets (ICS-20) for testing purposes.

Problem Definition

Until migration to latest ICS specs and protos (stargate-5/ stargate-6 see cosmos/ibc-proto-rs#12) we have been using the Go relayer CLI. With the changes for on-chain ID allocation it is not possible at this point to use it to test the Rust relayer loop (packet-recv and packet-ack CLIs can be used) . In addition we want more capabilities, e.g. specify the number of packets to be sent, the timeout height or timeout stamp etc.

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