Add a Dekorate disclaimer to all generated files

[pjgg]

Some Quarkus extensions as Quarkus-helm are using internally Dekorate library in order to generate some k8s yamls from a Quarkus application.properties. From a user experience, I think that would be great to add a disclaimer on top of these files to keep inform the developers that this files were autogenerated.

For example:

 Autogenerated by Dekorate

 DO NOT EDIT DIRECTLY

[rsvoboda]

@Sgitario fyi

[Sgitario]

cc @iocanel @aureamunoz

[iocanel]

I agree with the idea. I am not sure about the technical challenges as we depend on jackson.