Function indy_sys::did::indy_set_endpoint_for_did

#[no_mangle]pub unsafe extern "C" fn indy_set_endpoint_for_did(
    command_handle: CommandHandle, 
    wallet_handle: WalletHandle, 
    did: CString, 
    address: CString, 
    transport_key: CString, 
    cb: Option<ResponseEmptyCB>
) -> Error