Extract light client implementations into separate crates

[hu55a1n1]

Summary

The module and relayer code relies heavily on enums such as AnyClientState, AnyClient, etc. which define one variant per type of light-client supported. As we look to add support for more light-clients, it would be great for the module code to be agnostic to the light-client implementation. This will also light-client implementations to be hosted outside of the ibc-rs repo and maintained independently.

Problem Definition

Tight coupling with Any* types and circular dependency between light-client code and module code.

Proposal

Remove all occurrences of Any* enums and solve circular dependencies between crates if any.

Acceptance Criteria

Light clients can be hosted outside of the ibc-rs repo.

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