This augments the injection codegen with the capability to produce a duck.InformerFactory
attached to context for each type that we process.
Now a `duck.InformerFactory` for "Addressable" can be produced by "Get"ing it from the context.
This is triggered by placing `// +genduck` on the type that implements `duck.Implementable`.
* update codegen so the fatal error messages are more informative
String representation of an untyped nil is 'nil' so the Fatal messages weren't useful
* generate k8s injection code
* generate apiextensions injection code
* use Fatal & move output paths
* switch from Fatal to Panic
* injection creates a single factory
Scott Nichols