Migrate nephio-controllers from examples to core

[johnbelamaric]

And rename to nephio-operator, update image tag to :latest.

[nephio-prow]

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[electrocucaracha]

@johnbelamaric isn't redundant to call this package nephio-operator given that it lives under the nephio folder? What about just operator like the nephio/core/operator folder?

At the end, users can clone it with whatever name that they prefer

[johnbelamaric]

At the end, users can clone it with whatever name that they prefer

True, so we could do as you suggest. My only (minor) concerns with that would be how it appears in lists (though the repo should be with it) and whether people cloning it would by default keep the same name (which is super generic).

I am ok either way, though. Anyone else have an opinion?

[electrocucaracha]

Ok, we can create a topic in the GitHub discussion to evaluate pros and cons. I think for now we can merge this one

/lgtm