napi get and clear last exception

napi_status napi_get_and_clear_last_exception(napi_env env,
                                              napi_value* result);

• [in] env: The environment that the API is invoked under.
• [out] result: The exception if one is pending, NULL otherwise.

Returns napi_ok if the API succeeded.

This API can be called even if there is a pending JavaScript exception.