Interchain Security

[agouin]

Introduces interchain.AddProviderConsumerLink to declare a provider/consumer relationship that should be established during interchain.Build

ic := ibctest.NewInterchain().
	AddChain(provider).
	AddChain(consumer).
	AddRelayer(r, "relayer").
	AddProviderConsumerLink(ibctest.ProviderConsumerLink{
		Provider: provider,
		Consumer: consumer,
		Relayer:  r,
		Path:     ibcPath,
	})

This should be used in place of AddLink for IBC of ICS linked chains, as it will start the chains and establish both the provider/consumer port channels and the transfer channels between the two chains.

Adds StartProvider and StartConsumer methods to *cosmos.CosmosChain and wires them into the ChainSet Start method for starting the provider(s) first, then any consumers.