Connection create CLI

[adizere]

Crate

ibc-relayer and ibc-relayer-cli

Summary

Sub-issue of #628.

Establish a new IBC connection (not channel) between two chains. Either have a script, or builtin functionality to keep retrying the process until it succeeds.

• create connection <chain-a-id> <chain-b-id>
  • Optional: [--delay <delay>]
• create connection <chain-a-id> --client-a <client-a-id> --client-b <client-b-id>
  • Optional: [--delay <delay>]

Historical info

Originally, we wanted this CLI to resemble the channel handshake command, as follows:

hermes connection handshake ibc-0 ibc-1 client-ibc-0 client-ibc-1

In the meantime, however, we made a more formal list of use-cases we want to support in v0.2.0 which was captured in ADR 006, and fleshed out a concrete decision for the connection handshake CLI, consistent with other CLIs.

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[ancazamfir]

Could we discuss/ review #637 before starting on this issue?