Provide documentation and configuration examples for high availability operation of Ice REST Catalog

[hodgesrm]

The Ice REST Catalog is a potential single point of failure for operation on Iceberg tables. For production operation we need the following:

• Documentation of HA setup of Ice REST Catalog.
  • Includes database protection (e.g., etcd).
• Example configuration for Kubernetes.

For a first cut we can assume that production systems will run on Kubernetes and that users have K8s background knowledge required to scale stateful set replicas, apply anti-affinity settings, and use taints/tolerations to protect resources.

[subkanthi]

https://www.dremio.com/blog/benchmarking-framework-for-the-apache-iceberg-catalog-polaris/