Engine Wallet & 7702 Session Keys

[0xFirekeeper]

PR-Codex overview

This PR focuses on enhancing the Thirdweb library with new functionality for session keys and wrapped calls, specifically for the 7702 smart account model. It also updates access modifiers and introduces new methods for generating signatures and handling transactions.

Detailed summary

• Changed access modifiers from internal to public for properties in ThirdwebContract.
• Added new classes: SessionKeyParams_7702, Call, and WrappedCalls in AATypes.cs.
• Implemented methods for generating signatures for wrapped calls and session keys in EIP712.cs.
• Updated the Program.cs to include logic for session key creation and execution of wrapped calls.
• Introduced EngineWallet class with methods for interacting with a backend wallet service.
• Added error handling and validation for wallet operations in EngineWallet.

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