refactor: explicitly type EIP-712 transactions in signTransaction

[crStiv]

Refactors the signEip712TransactionInternal function to explicitly type transactions as TransactionRequestEIP712 to improve type safety and clarity when working with EIP-712 transactions.

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PR-Codex overview

This PR enhances the signEip712TransactionInternal function by explicitly typing the transaction as TransactionRequestEIP712, allowing for clearer handling of EIP-712 transactions and improving type safety.

Detailed summary

• The transaction variable is explicitly typed as TransactionRequestEIP712 & { type: 'eip712' }.
• The assignment of transaction.type is replaced with eip712Transaction.type.
• The from property check is updated to use eip712Transaction.
• The assertEip712Request call now spreads eip712Transaction instead of transaction.
• The call to getTransactionWithPaymasterData now uses eip712Transaction instead of transaction.

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