Restructure the ibc crate to mirror ibc-go's structure

[seanchen1991]

Crate

The ibc crate

Summary

Clean up the structure of the ibc crate so that it mirrors the structure of ibc-go, more specifically splitting the contents between Core components (Clients, Connections, Channels, etc.), Applications (Fungible Token Transfers, Interchain Accounts, etc.), and Light Clients (Tendermint).

Problem Definition

This will help to consolidate repository structures across the main IBC implementations in the ecosystem. It will also more clearly delineate the logical structure of the ibc crate; the current crate structure doesn't really do a good job of this.

Proposal

Restructure the ibc crate to mirror ibc-go's structure.

Acceptance Criteria

The structure of the ibc crate mirrors ibc-go's structure.

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