[WIP][Addon #579] Add Apache Kyuubi as a experimental addon

experimental/addons/kyuubi/README.md

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+# kyuubi
+
+Apache Kyuubi is a distributed and multi-tenant gateway to provide serverless SQL on data warehouses and lakehouses.
+
+For more information about Apache Kyuubi, please see the Apache Kyuubi documentation: https://kyuubi.readthedocs.io/en/master/.
+
+## Install
+
+Add experimental registry
+
+```
+vela addon registry add experimental --type=helm --endpoint=https://addons.kubevela.net/experimental/
+```
+
+Enable this addon
+
+```
+vela addon enable fluxcd
+vela addon enable kyuubi
+```
+
+Uninstall
+
+```
+vela addon disable kyuubi
+```
+
+# To check the kyuubi running status
+
+* Firstly, check the kyuubi(and the fluxcd and we need to deploy by helm) running status:
+
+```
+vela addon status kyuubi
+vela ls -A | grep kyuubi
+```
+
+

experimental/addons/kyuubi/metadata.yaml

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+description: A distributed and multi-tenant gateway to provide serverless SQL on lakehouses.
+icon: "https://raw.githubusercontent.com/apache/kyuubi/master/docs/imgs/logo.png"
+invisible: false
+name: kyuubi
+tags:
+- apache/kyuubi
+version: 1.6
+url: https://github.com/apache/kyuubi
+
+dependencies:
+  - name: fluxcd
+
+system:
+  vela: ">=1.5.0-beta.3"

experimental/addons/kyuubi/parameter.cue

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+// parameter.cue is used to store addon parameters.
+//
+// You can use these parameters in template.cue or in resources/ by 'parameter.myparam'
+//
+// For example, you can use parameters to allow the user to customize
+// container images, ports, and etc.
+parameter: {
+	// +usage=Deploy to specified clusters. Leave empty to deploy to all clusters.
+        clusters?: [...string]
+	// +usage=Namespace to deploy to
+        namespace: *"kyuubi-ns" | string
+	// +usage=Specify the image repository
+        "imageRepository": *"apache/kyuubi" | string
+	// +usage=Specify the image tag
+        "imageTag": *"" | string
+}

experimental/addons/kyuubi/template.cue

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+package main
+output: {
+	apiVersion: "core.oam.dev/v1beta1"
+	kind:       "Application"
+	spec: {
+		components: [{
+               		type: "k8s-objects"
+                	name: "kyuubi-ns"
+                	properties: objects: [{
+                        	apiVersion: "v1"
+                        	kind:       "Namespace"
+                        	metadata: name: parameter.namespace
+                	}]
+		},
+		{
+			name: "kyuubi-helm"
+			type: "helm"
+			dependsOn: ["kyuubi-ns"]
+			properties: {
+					repoType:        "helm"
+					url: 		 "https://awesome-kyuubi.github.io/kyuubi-helm-chart/"
+					chart:           "kyuubi"
+					targetNamespace: parameter["namespace"]
+					version:         "0.1.0"
+					values: {
+						image: {
+							repository: parameter["imageRepository"]
+							tag:        parameter["imageTag"]
+						},
+						kyuubiConf: {
+                            				kyuubiDefaults: """
+							spark.master=local
+							"""
+                        			}
+					}
+			}
+		}]
+		policies: []
+	}
+}