Implement ICS-08 Wasm light client domain types

[Farhad-Shabani]

Background

Implement the required ICS-08 Wasm light client domain types to facilitate the development of CosmWasm light clients. This will empower users to deploy their CosmWasm contracts on Cosmos chains integrated with the Wasm-enabled version of ibc-go, thereby enabling seamless IBC communication with non-Cosmos chains.

Worth noting that ibc-go team has recently released their 08-wasm proxy light client implementation.

This initiative aligns with the broader goal of implementing a CosmWasm client for Sovereign SDK rollups, targeting deployment on Cosmos chains: informalsystems/sovereign-ibc#18