Spawn event monitor only when needed

[romac]

Crate

ibc-relayer

Summary

Spawn the event monitor only for commands which need it.

Problem Definition

Commands which do not need the event monitor shouldn't need to incur the penalty of spawning it and subscribing to queries.

Proposal

Spawn the event monitor only for commands which need it.

Acceptance Criteria

When commands which do not need the event monitor do not spawn it.

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
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