feat: add Zero-Knowledge Token Wrapper

[Zyra-V21]

Summary

This PR proposes a new standard for Zero-Knowledge Token Wrappers on Starknet - a permissionless interface for adding privacy to existing tokens (ETH, SNIP-2) using STARK proofs.

Key Features

• Permissionless Privacy: Wrap any token without issuer permission
• L2-Optimized: Designed for Starknet's low costs and native STARK verification
• Exchange Compatible: Full SNIP-2 (ERC20) interface
• Quantum Resistant: STARK-based proofs
• Account Abstraction Native: Leverages Starknet's AA capabilities

Reference Implementation

• Working testnet deployment (zkETH on Starknet Sepolia)
• Contract: MAINNET/contracts/src/tokens/zketh_wrapper.cairo
• Uses STWO Circle STARKs for proof verification

Related Work

• Similar to EIP-7503 (Zero-Knowledge Wormholes) and ERC-8065
• Optimized for Starknet's architecture and cost model

Ready for community review and feedback!

[Zyra-V21]

Hello just want to make sure you have received the proposal