Expose noDeploy option (aka dry-run mode)

This is a small tweak to expose the `noDeploy` option. I found this useful for some work I'm doing which requires generation of the cloudformation for additional stacks without applying the change.

_Originally posted by @DavidSManning in https://github.com/nordcloud/serverless-plugin-additional-stacks/issues/47#issuecomment-1127789950_