Implement Merkle proof verification (existence & non-existence) for Comet Cairo contract

[Farhad-Shabani]

Summary

Implement the verification of existence (verify_membership) and non-existence (verify_non_membership) Merkle proofs for the CometBFT Cairo contract. These proofs typically accompany various IBC packets sent to a counterparty chain and are validated by the light client representing the source chain.
The task involves developing an implementation of the ICS-23 vector commitment in Cairo, potentially as a general-purpose library, and integrating it into the CometBFT client contract.