Reconcile Ingress objects for ScyllaCluster

[zimnx]

ScyllaCluster CRD is extended with ExposeOptions and Domains allowing users to configure domain, ingress class name and custom annotations. If provided, Operator creates an Ingress object for each Scylla Node pointing directly to it, and one additional Ingress for headless Service allowing accessing any of available Scylla Nodes.

ExposeOptions are considered as experimental and are subject for deprecation and incompatible changes. Using it, may require manual steps during upgrades. User discretion is advised.

[zimnx]

@tnozicka PTAL

[zimnx]

@tnozicka as discussed, support for alternator is removed.