Refactor GSuite Groups Reconciler Application

[upodroid]

Hello

I'm a contributor with Knative and we have implemented the GSuite Groups Reconciler at knative/community#905. However, this package has hardcoded references to kubernetes.io, critical validation is done go test instead of a cli sub command which forced us to clone the code and replace k8s specific references instead of go install k8s.io/k8s.io/groups@v0.0.0-20220124221514-b894a331a999.

I'm proposing:

• groups validate command - equivalent to make test
• groups plan command - equivalent to make run
• groups apply command - equivalent to make run -- --confirm
• Make the domain configurable through config.yaml

Thank you

/cc @dims @dprotaso

[dims]

@upodroid sounds like the right thing to do. Hoping these are minimal changes since we have a bunch of things we'll need to fix and this is already "production" code for us.

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[dprotaso]

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