Relayer CLIs for client create messages

[ancazamfir]

Summary

We should be able to send transactions from the relayer CLI for all IBC client related messages.

Proposal

The following CLIs should be implemented by the relayer:

1. relayer tx raw create-client <to-chain-B> <chain-A> <client-id-A>
   • creates a client of chain-A, with id client-id-A, on chain to-chain-B:
     • sends request to local relayer light client for chain-A to retrieve latest header header_A
     • sends a MsgCreateClient to chain-B with:

    client_id = client-id-A,
    header=header_A,
    trusting_period: get_trusting_period(chain-A),
    bonding_period: get_bonding_period(chain-A),
    signer: get_account(chain-B),

2. relayer tx raw update-client <to-chain-B> <chain-A> <client-id-A> -h <A-height>
   This sub-issue was moved here: Relayer CLIs for client update message #277

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[ancazamfir]

update-client still needs to be implemented.