Make events emitted in handlers compatible with ibc-go

[plafer]

Summary of Bug

We currently don't output the same events as ibc-go (e.g. due to the extensive use of default values).

Acceptance criteria

• All our handlers output events under the same conditions as ibc-go
• No default values are used

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For Admin Use

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