Draft: Add Spark Structured Streaming based Benchmarks

This merge request includes Spark Structured Streaming benchmarks for use-cases 1 to 3. Furthermore, all necessary resources for execution with Theodolite on a Kubernetes cluster are included.

theodolite-benchmarks/definitions/uc1-spark/resources/driver-deployment.yaml

+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: spark-driver
+  labels:
+    app: spark
+spec:
+  selector:
+    matchLabels:
+      app: spark
+      component: driver
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: spark
+        component: driver
+    spec:
+      containers:
+        - name: spark
+          image: "happyente/uc1-spark:latest"
+          args: [
+          "driver"
+          , "--master", "spark://spark-master:7077"
+          # , "--executor-memory"  , "4G" # If resource nodes lacks resources (for example if limited by kubernetes), this will result in failure!!!
+          # , "--total-executor-cores", "1"
+          , "--class" , "org.apache.spark.examples.JavaSparkPi"
+          , "--conf"  , "spark.driver.port=7077"
+          , "--conf"  , "spark.driver.blockManager.port=7078"
+          , "--conf"  , "spark.driver.host=spark-driver" # TODO what is the right value here???
+          , "--conf"  , "spark.cores.max=1"
+          , "/opt/spark/examples/jars/spark-examples_2.12-3.2.0.jar"
+          ]
+          env:
+            - name: SPARK_DRIVER_BIND_ADDRESS
+              value: "0.0.0.0"
+          ports:
+            - containerPort: 7077
+              name: driver-rpc # TODO what kind of interface is deployed?
+            - containerPort: 7078
+              name: blockmanager