ERA-60183,ERA-60184,ERA-60186: controller image 0.5.3, bump-up kube-rbac-proxy from 0.18.0 to 0.20.2

[shivaprasadmb]

Release Notes:

• NDBServer is cluster-scoped – NDBServer is now a cluster-scoped resource; create it once and reference it by name from any namespace.
• Credentials in a dedicated namespace – NDB API credentials are specified via credentialSecretRef (secret name + namespace), e.g. ndb-credentials, instead of a namespaced secret name only.
• Name to UUID resolution: cluster name, snapshot name are resolved to uuid internally in database CRs to make it developer friendly.
• Helm chart README.md : The README.md has been updated with instructions for Helm installation and the command to show versions.