The Ethereum address that controls the account.
fn owner(env: soroban_sdk::Env) -> soroban_sdk::BytesN<20>fn __check_auth(
env: soroban_sdk::Env,
signature_payload: soroban_sdk::BytesN<32>,
signature: soroban_sdk::BytesN<65>,
auth_contexts: soroban_sdk::Vec,
) -> Result<(), AccountError> Binds the account to its owner's Ethereum address, for good.
fn __constructor(env: soroban_sdk::Env, owner: soroban_sdk::BytesN<20>)