Add syntax highlighting + Auto-Completion in Jetbrains IDEs

[kenho811]

Step 1: Generate .json files for the manifest schemas and save them in resource folder

https://github.com/redhat-developer/intellij-kubernetes/blob/main/src/main/resources/schemas/k8s.io/statefulsetpersistentvolumeclaimretentionpolicy-apps-v1.json#L17