Create the necessary pieces in order to build a Kubernetes operator

[esposem]

This is an attempt to address #345 and create a Kubernetes operator to run agent-sandbox

Basically we fist need the right folder structure, with config/ and bundle/. This is usually generated by the operator-sdk but for some reason that was not the case here. So right now I tried to simply copy and refactor the necessary files into the right folders. I didn't modify the existing files.

There are still a couple of open ended questions that would be nice to discuss:

• The --extension cmdline is enabled in the controller. This was done to simplify the work and not have two deployments/controllers. Alternatively we can have a default configMap to load such options at runtime?
• what to do with k8s/. Should we move everything out of k8s/? Or have symlinks into /config?
• If/once we have an official image, where should we push it officially? We could create a quay.io org for example

Another option for the future is to keep the operator development in a separate branch until it successfully works.

[netlify]

✅ Deploy Preview for agent-sandbox canceled.

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🔨 Latest commit	849856b
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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: esposem / name: Emanuele Giuseppe Esposito (1288cbf, 1fe76ff, 23f204b, 4986f29, 652d2e2, 6c421f6, 849856b, 8cab245, 9f536fa, ba597d7)

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[k8s-ci-robot]

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: esposem
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[k8s-ci-robot]

@esposem: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
presubmit-agent-sandbox-lint-api	b12b64c	link	true	/test presubmit-agent-sandbox-lint-api
presubmit-agent-sandbox-e2e-test	849856b	link	true	/test presubmit-agent-sandbox-e2e-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.