Get frozen_height of any client

[yito88]

Crate

modules

Summary

I'd like to add frozen_height() function to ics02_client::client_state::ClientState so that we can check if the client at the given height is frozen

Problem Definition

MockClientState doesn't have frozen_height for now. If it has, we can add frozen_height() to ClientState trait and easily check the height when validations.

Proposal

• Add frozen_height() function to ics02_client::client_state::ClientState
• Add frozen_height to MockClientState

Acceptance Criteria

frozen_height() function can be used for any client

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