Enable bootstrapping statefulsets

[abdurrehman107]

What this PR does:
This PR enables bootstrapping StatefulSets. The controller:

1. Fetches the EtcdCluster resource.
2. Checks for an existing StatefulSet:
   • If missing and Spec.Size > 0, creates a StatefulSet with replicas = 0.
3. Sets ownership using SetControllerReference for proper garbage collection.

It follows the workflow mentioned here.

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[ahrtr]

Thanks @abdurrehman107 for the PR. Based on our discussion in last WG meeting, @ Gaurav Dasson is supposed to deliver a PR for this. I am not sure what's his progress so far. Let me ping him in slack.

Also I'd like to see a complete PR to transfer all the implementation of syncHandler (around 300 -400 lines of code).

[ahrtr]

@abdurrehman107 since there is no response from Gaurav Dasson, please feel free to continue to work on this. Could you deliver a complete PR to transfer all the implementation of syncHandler (around 300 -400 lines of code)?

[ahrtr]

The goal is to implement the initial Reconcile workflow based on syncHandler . Please ensure that you verify it in a K8s cluster. thx

[abdurrehman107]

Could you deliver a complete PR to transfer all the implementation of syncHandler (around 300 -400 lines of code)?

Yes I can. I'll ask for help in the wg slack channel.

Please ensure that you verify it in a K8s cluster. thx

Aighty.