Celo USD TokenPaymaster - #90

PR-Codex overview

This PR introduces support for the CELO_CUSD token in the SmartWallet and adds commented-out code snippets for creating and managing ERC20 Smart Wallets and InAppWallets using Celo Dollar.

Detailed summary

• Added CELO_CUSD token configuration in SmartWallet.cs.
• Updated TokenPaymasterConfig with details for CELO_CUSD.
• Added commented-out code for creating an ERC20 Smart Wallet using CELO_CUSD in Program.cs.
• Added commented-out code for creating an InAppWallet in Program.cs.

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