feat(client): EVM CallSet signers — Eip712 Hash/TypedData split, additional_data, signMessage (#912)

Split the EVM CallSet signer into Eip712HashSigner (raw key) + Eip712TypedDataSigner (browser
eth_signTypedData_v4). Align the CallSet EIP-712 type to starkware_accounts (add additional_data,
type hash 0xa6b8...). Add computeOutsideExecution712Hash + signMessage over a SNIP-9 OutsideExecution.
Verified against starkware_accounts' golden vectors.

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