Add additional printing columns

[coro]

This closes #647

Note to reviewers: remember to look at the commits in this PR and consider if they can be squashed

Summary Of Changes

This adds two columns to the output of kubectl get for RabbitmqClusters:

• AllReplicasReady
• ReconcileSuccess

These correspond to the equivalent fields in the Status of the object in question.

Additional Context

For example, when creating a 3-node cluster:

Once the deployment is complete:

After applying an update to the cluster:

After applying an update that fails to reconcile (in this case, some override config that was incorrect):

I considered adding system tests for this feature, however decided against it as I believe these tests would be too brittle to changes to kubectl itself, and feels outside the remit of testing for this repo.

Local Testing

Please ensure you run the unit, integration and system tests before approving the PR.

To run the unit and integration tests:

$ make unit-tests integration-tests

You will need to target a k8s cluster and have the operator deployed for running the system tests.

For example, for a Kubernetes context named dev-bunny:

$ kubectx dev-bunny
$ make destroy deploy-dev
# wait for operator to be deployed
$ make system-tests

[ChunyiLyu]

WOW! nice feature 🚢

[ChunyiLyu]

I think @Zerpet would be very happy about this PR 😄 I remember him talking about adding print columns before.

[ablease]

This is great, thanks connor! :)