Document ClusterWide(ScanType|ParseDefinition|ScanCompletionHook) and how they can be used

## 📚 Documentation Issue

### Where to find the issue

everywhere

### Describe the issue

We have supported the cluster wide versions of our crds for while but they have been largely undocumented

### Suggested change

Add a how-to guide to show how they can be used.
Add API Reference docs for each cluster wide crds
