Improve logging output of aso-gen

[theunrepentantgeek]

Describe the current behavior

Currently our generator uses klog for output, which results in every line including this standard hard coded prefix:

 I0406 08:02:36.555009   23800 resource_importer.go:130]

While this prefix is excellent for background services, it is less valuable for a console application - and I suspect serves to make the generator more intimidating to use.

For those of us who created the generator, this isn't a factor, but for anyone looking to contribute to the operator (especially for developers wanting to contribute a specific resource), there's a distinct possibility of the output dissuading the contribution.

Describe the improvement

I suggest we refactor the generator to use the standard logr.Logger API, and to use a more friendly logger (perhaps zerolog in console mode).