Create rockcraft project for knative operator

[NohaIhab]

Context

Create a rockcraft project for the gcr.io/knative-releases/knative.dev/operator/cmd/operator image

What needs to get done

1. Create the rockcraft.yaml for the operator image based on the Dockerfile
2. Write the sanity tests for the rock

Definition of Done

A directory with a rockcraft project and sanity tests is added in this repository and the container image resulting from it is published in the team's Dockerhub registry.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6514.

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