Function indy_sys::ledger::indy_sign_and_submit_request

#[no_mangle]
pub unsafe extern "C" fn indy_sign_and_submit_request(
    command_handle: CommandHandle, 
    pool_handle: PoolHandle, 
    wallet_handle: WalletHandle, 
    submitter_did: CString, 
    request_json: CString, 
    cb: Option<ResponseStringCB>
) -> Error