Add validation on the r.Kind field

[remyleone]

What happened?

I've used a configurator like this:

	p.AddResourceConfigurator("scaleway_instance_ip", func(r *config.Resource) {
		// Identifier for this resource is assigned by the provider. In other
		// words it is not simply the name of the resource.
		r.ExternalName = config.IdentifierFromProvider
		r.ShortGroup = "instance"
		r.Kind = "ip"
	})

The problem is that it created issue in angryjet like this:

angryjet: error: error loading packages using pattern ./...: /Users/sieben/workspace/crossplane-scaleway-provider/apis/instance/v1alpha1/zz_ip_types.go:97:25: cannot use &(ip literal) (value of type *ip) as "k8s.io/apimachinery/pkg/runtime".Object value in argument to SchemeBuilder.Register: missing method DeepCopyObject
exit status 1
apis/generate.go:38: running "go": exit status 1
11:00:24 [FAIL]
make[1]: *** [go.generate] Error 1
make: *** [generate] Error 2

I've fixed it using IP instead of ip. Maybe it could be a good idea to add validation on the r.Kind field about the convention for kind (uppercased, lowercase, camelcase, ...)

How can we reproduce it?

[muvaf]

@remyleone The reason it fails is because the type has to be exported, hence start with uppercase in Go. But it's a great idea to have a validation since it's not clear that this is the problem. Maybe here after all configurators are run?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.