✨ feat: add verbose logging option to controller-gen

[wazery]

Adds verbose logging to controller-gen which is disabled by default, and can be enabled. It uses slog as suggested in the issue #889

Example:

./controller-gen crd verbose=true paths=./pkg/crd/testdata output:stdout

Fixes: #889

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @wazery. Thanks for your PR.

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[wazery]

@JoelSpeed many thanks for the valuable insights, I reflected them all in the PR now.