[Addon kubevela#603] Add Apache Spark as a experimental addon

Signed-off-by: yanghua <yanghua1127@gmail.com>

addons/spark-kubernetes-operator/README.md

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+# spark-kubernetes-operator
+
+This is an addon template. Check how to build your own addon: https://kubevela.net/docs/platform-engineers/addon/intro

addons/spark-kubernetes-operator/metadata.yaml

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+description: A kubernetes operator for Apache Spark
+icon: "https://spark.apache.org/images/spark-logo.png"
+invisible: false
+name: spark-kubernetes-operator
+tags:
+  - GoogleCloudPlatform/spark-on-k8s-operator
+version: v1beta2-1.3.8-3.1.1
+url: https://github.com/GoogleCloudPlatform/spark-on-k8s-operator
+
+dependencies:
+  - name: fluxcd
+
+system:
+  vela: ">=1.5.0-beta.3"
+#  kubernetes: ">=1.16"

addons/spark-kubernetes-operator/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=Custom parameter description
+	myparam: *"myns" | string
+	//+usage=Deploy to specified clusters. Leave empty to deploy to all clusters.
+        clusters?: [...string]
+	//+usage=Namespace to deploy to, defaults to cert-manager
+        namespace: *"spark-operator" | string
+	// +usage=Specify if create  the webhook or not
+        "createWebhook": *true | bool
+	// +usage=Specify the image repository
+        "imageRepository": *"ghcr.io/googlecloudplatform/spark-operator" | string
+        // +usage=Specify the image tag
+        "imageTag": *"v1beta2-1.3.8-3.1.1" | string
+	// +usage=Specify if create the sa for job or not
+        "createSparkServiceAccount": *false|bool
+}

addons/spark-kubernetes-operator/schemas/myschema.yaml

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+# We put UI Schemas that correspond to Definitions in schemas directory.
+# References:
+# - https://kubevela.net/docs/platform-engineers/addon/intro#schemas-directoryoptional
+# - https://kubevela.net/docs/reference/ui-schema
+- jsonKey: myparam
+  label: MyParam
+  validate:
+    required: true

addons/spark-kubernetes-operator/template.cue

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+package main
+output: {
+	apiVersion: "core.oam.dev/v1beta1"
+	kind:       "Application"
+	spec: {
+		components: [
+			{
+                                type: "k8s-objects"
+                                name: "spark-operator-ns"
+                                properties: objects: [{
+                                        apiVersion: "v1"
+                                        kind:       "Namespace"
+                                        metadata: name: parameter.namespace
+                                }]
+                        },
+                        {
+                            name: "spark-operator-helm"
+                            type: "helm"
+                            dependsOn: ["spark-operator-ns"]
+                            type: "helm"
+                            properties: {
+                                    repoType: "helm"
+                                    url:      "https://googlecloudplatform.github.io/spark-on-k8s-operator/"
+                                    chart:    "spark-operator"
+                                    targetNamespace: parameter["namespace"]
+                                    version:  "1.1.26"
+                                    values: {
+                                            image: {    
+						repository: parameter["imageRepository"]
+                                                tag: parameter["imageTag"]
+                                            }
+
+					    serviceAccounts: {
+                                                spark: {
+						    create: parameter["createSparkServiceAccount"]
+						}
+					    }
+
+					    serviceAccounts: {
+						sparkoperator: {
+                                                    name: "spark-kubernetes-operator"
+						}
+                                            }
+
+					    webhook: {
+						enable: parameter["createWebhook"]
+               				    }
+
+                                    }
+                            }
+                        },
+		]
+		policies: [
+		    {
+			name: "gc-dependency",
+			type: "garbage-collect",
+			properties: {
+			    order: "dependency"
+			}
+		    }
+		]
+	}
+}

addons/spark-kubernetes-operator/views/my-view.cue

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+// We put VelaQL views in views directory.
+//
+// VelaQL(Vela Query Language) is a resource query language for KubeVela, 
+// used to query status of any extended resources in application-level.
+// Reference: https://kubevela.net/docs/platform-engineers/system-operation/velaql
+//
+// This VelaQL View querys the status of this addon.
+// Use this view to query by:
+//     vela ql --query 'my-view{addonName:spark-kubernetes-operator}.status'
+// You should see 'running'.
+
+import (
+	"vela/ql"
+)
+
+app: ql.#Read & {
+	value: {
+		kind:       "Application"
+		apiVersion: "core.oam.dev/v1beta1"
+		metadata: {
+			name:      "addon-" + parameter.addonName
+			namespace: "vela-system"
+		}
+	}
+}
+
+parameter: {
+	addonName: *"spark-kubernetes-operator" | string
+}
+
+status: app.value.status.status