Timestamps have wrong type

The timestamps have incorrect typescript types.
For example
https://github.com/kubernetes-client/javascript/blob/master/src/gen/model/v1ObjectMeta.ts#L32

creationTimestamp is of type Date | undefined, but the documentation says it's an RFC3339 formatted date aka a string.

Since this is generated code I'm not sure of where to fix this. Either the type has to change to string | undefined, or the string has to be parsed and passed on as a date object.

Start with src/gen/model/v1ObjectMeta.ts around the creationTimestamp definition and compare its TypeScript type with the RFC3339 string described in the issue. Trace how this generated model is produced or consumed to determine whether the type or runtime representation is inconsistent. Done means the timestamp type and its actual representation agree with the documentation.

Written by the indexing model from the issue text.