InAppWallet -> Enclave

[0xFirekeeper]

Merge when backend is ready

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PR-Codex overview

This PR focuses on refactoring the InAppWallet and EcosystemWallet classes, enhancing the handling of user authentication methods, and improving the structure of linked account management.

Detailed summary

• Changed User to null in EmbeddedWallet.
• Updated SendPhoneOtpAsync and SendEmailOtpAsync methods to remove return values.
• Introduced UserStatusResponse and LinkedAccount structures.
• Refactored methods to use properties instead of private fields in EcosystemWallet.
• Adjusted error handling and validation in authentication methods.
• Enhanced GetLinkedAccounts and LinkAccount methods for better readability and performance.
• Updated documentation for clarity on parameters and return types.
• Improved method signatures for consistency across classes.

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