feat: Sovereign light client implementation - first iteration

[Farhad-Shabani]

Closes: #18

Description

This PR marks the initial phase of the Sovereign light client implementation. The key highlights include:

• Implementation of the ICS-08 Wasm client types. It is migrated to ibc-rs. This is utilized for the CosmWasm contract implementation.
• Definition of relevant proto files and construction of Rust proto types within a feature branch in ibc-proto-rs.
• Establishment of light client data structures and types under the sov-celestia-client-types crate.
• Partial implementation of the light client logic in the sov-celestia-client crate. The remaining methods (specifically verifications) will be addressed in a subsequent PR, once we have solid data structures and understanding of the ZK proof verifier.
• First iteration of CosmWasm contract implementation in the sov-celestia-client-cw crate.
• Addition of a test for updating the Sovereign light client on a mock Cosmos chain. The Sovereign light client has been integrated into the basecoin-rs in a feature branch.
• Definition of dummy ClientState, ConsensusState, and Header builders utilized for writing tests.

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PR author checklist

• Linked to GitHub issue.
• Added tests.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.