Changing the start params should cause panic instead of failing workflow

[longquanzheng]

Today it will fail the workflow. We should panic like any non-deterministic errors.

"details": {
      "reason": "cadenceInternal:Generic",
      "details": "unable to encode argument: 0, types.EnrollmentUUID, with json error: json: error calling MarshalJSON for type types.EnrollmentUUID: Zero-value UUIDs cannot be created",
      "decisionTaskCompletedEventId": 1232,
      "details_base64": "dW5hYmxlIHRvIGVuY29kZSBhcmd1bWVudDogMCwgdHlwZXMuRW5yb2xsbWVudFVVSUQsIHdpdGgganNvbiBlcnJvcjoganNvbjogZXJyb3IgY2FsbGluZyBNYXJzaGFsSlNPTiBmb3IgdHlwZSB0eXBlcy5FbnJvbGxtZW50VVVJRDogWmVyby12YWx1ZSBVVUlEcyBjYW5ub3QgYmUgY3JlYXRlZA=="