Automated End-to-end IBC tests

[michaelfig]

End-to-end IBC tests.

We would like to work together with Strangelove to use their Go-orchestrated Docker test framework to test:

• Agoric-to-Cosmos outbound channel is automatically relayed
  • Agoric-to-Cosmos mangled packet errors are propagated back to the sender
• Agoric-to-Cosmos bidirectional fungible token transfer via Pegasus
• Agoric-to-Cosmos Interchain accounts
• Hermes relayer works in addition to Go relayer

This epic will result in more work items.

[dckc]

we're cheering on Jack Z. and gang

[dckc]

seems to have come together in multichain-testing