Re-use ics02_client::Height in ics24_host::Path

[seanchen1991]

Crate

The ics24_host module in the ibc crate.

Summary

Replace Path::ClientConsensusState epoch and height with ics02_client::Height.

Problem Definition

Currently, Path::ClientConsensusState represents epoch and height as plain u64s. These should instead be encapsulated by a ics02_client::Height type.

Proposal

Change Path::ClientConsensusState { epoch: u64, height: u64 } -> Path::ClientConsensusState { height: Height }.

Acceptance Criteria

Change Path::ClientConsensusState { epoch: u64, height: u64 } -> Path::ClientConsensusState { height: Height }. Handle any ripple effects as appropriate.

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