operator-sdk new should also generate deepcopy functions for custom resource

[fanminshi]

The current operator-sdk generates a skeleton that doesn't include deepcopy functions for the custom resource. It is still compilable because non of the custom resource objects are being used by sdk.Watch() on default. However, if user changes sdk.Watch() to watch on the custom resource and then converts the watched object to the custom resource type, then the code becomes non-compilable.

To resolve this potential issue, the operator-sdk new should generate deepcopy functions for the custom resource when creating a new project.