Implemented first usable version of the RBAC Operator

[ggkhrmv]

The first version of the RBAC Operator has been implemented. The make deploy command doesn't work yet, since I couldn't push the docker image to the repo.

To run the controller locally:

make manifests
make install
export ENABLE_WEBHOOKS=false
make run

[agaudreault]

LGTM, it seems like you have used the latest version of https://github.com/kubernetes-sigs/kubebuilder. However, I think the controller might try to do too much already. Can we limit the first version to manage policy.*.csv keys only in configurable namespaces? This seems to be the main use case.

On another note, @sbeginCoveo @ggkhrmv if you want to discuss on the CNCF Slack, just send me a DM. I would like to have a chat to understand why this operator is a must for you. In almost all ArgoCD deployments I have come across, the global rbac policy configuration don't change often. Usually, it is the policies in the AppProject resource that are harder to define and manage. So I am struggling to grasp the long-term value of this operator, even though it is a nicer way to write the policies.

[sbeginCoveo]

Nothing too deep to address, well done implementing the bindings reconciler
Great job giving users feedback though the status 🚀 That's really awesome
I'm gonna give it a spin on my cluster

[leoluz]

Added a minor comment.
LGTM regardless