ChildProcess.send alters node options during serialization which cause errors

Ganache option `time` [doesn't work](https://forum.openzeppelin.com/t/openzeppelin-test-environment-setup-ganache-with-a-specific-timestamp/2756) because options are getting [serialized](https://github.com/OpenZeppelin/openzeppelin-test-environment/blob/558c5bae6e0f88ccf848eda8d61e881d9a4da7fd/src/setup-ganache.ts#L49) to strings.