[Features] Support Pause and Resume Reconcilation of a Cluster

[shanshanying]

 kubectl rollout pause --help
Mark the provided resource as paused.

 Paused resources will not be reconciled by a controller. Use "kubectl rollout resume" to resume a paused resource.
Currently only deployments support being paused.

kubectl supports pause and resume reconcliation of a resource. But only for deployment. In KubeBlocks, we can support pause/resume recocliation of a Cluster (and resources owned by cluster, such as component, config controller) We can mark a Cluster as paused by adding an annotation, or update a field, etc.

In KB we have a const for such purpose but it seems it is never used:

	// annotation keys
	ControllerPaused     = "controller.kubeblocks.io/controller-paused"