[ICS02] Implement IBC client recovery mechanisms

[Farhad-Shabani]

Problem Statement

If a client gets frozen or expired it can no longer be updated, the associated connection(s) and channel(s) will also stop working and funds in the channels will be permanently locked and not transferrable.

ibc-rs needs a mechanism by which frozen IBC clients can be recovered. This functionality has been implemented in ibc-go as part of ADR 026. We'll need to implement similar functionality in ibc-rs in order to maintain feature parity.

Tasks

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1. Add MsgRecoverClient and other necessary domain types #1112
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2. Implement ability to validate client substitute when recovering a client #1110
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3. Add logic to unfreeze frozen / expired clients #1111
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4. (feat) Integrate and test client recovery functionality informalsystems/basecoin-rs#173
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[rnbguy]

All the tasks are finished. Does that make this tracking issue finished too?

[Farhad-Shabani]

I think @seanchen1991 is addressing the final aspect of this feature in informalsystems/basecoin-rs#173 to ensure its functionality. Once that's completed, we can consider closing this issue.

[rnbguy]

@seanchen1991 we can close this now, right?