Add Other Item for Ics02Client,Ics03connection, Ics04Channel Error

[DaviRain-Su]

Summary

Add Other Item for Ics02Client,Ics03connection, Ics04Channel Error

Problem Definition

For downstream implementations of ibc-rs in ics02-client, ics03-connection, ics04-channel, some third-party libraries need to have their own error output, and these modules do not have an error item compatible with third-party implementations. I suggest adding an Other item to the error handling of these modules for downstream implementations to use.

Proposal

Add ics02-client, ics03-connection, ics04-channel Error module add below Other item.

define_error! {
    #[derive(Debug, PartialEq, Eq)]
    Error {
        Other 
            { description: String }
            | e | { format_args!("{}", e.description) }
   }
}

Acceptance Criteria

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned