Relay for all paths defined in the configuration

[romac]

Crate

ibc-relayer, ibc-relayer-cli

Summary

The start-multi command should relay packets and channel events for all paths defined in the configuration.

Problem Definition

Despite its name, the start-multi command only relay packets and channel events for a single path between two chains.
We would instead like to have it relay between all paths defined in the configuration, as a first step towards a passive relayer.

Proposal

Initially, the start-multi command will spawn a supervisor per path defined in the configuration.

Specific care must be taken in the case when multiple paths exists, where the supervisor needs to filter out some events that may not be relevant to it.

For example, if two paths A(ibc0 -> ibc1) and B(ibc0 -> ibc2) exist, the supervisor for B must ensure that it discards the events emitted by ibc0 which are only relevant to worker B because they target the chain ibc2.

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