Add PartialEq to IbcEvent

[yito88]

Crate

ibc

Summary

For equality comparison of events, I'd like to add PartialEq to IbcEvent

Problem Definition

No PartialEq for IbcEvent

Proposal

Just add PartialEq to IbcEvent and each event of modules

Acceptance Criteria

IbcEvent can be compared, e.g.

    if expected_event == actual_event {
        ...
    }

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