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/uc2-spark/uc2-spark-benchmark-operator.yaml

@@ -47,6 +47,6 @@ spec:
         replicationFactor: 1
       - name: "output"
         numPartitions: 40
-p        replicationFactor: 1
+        replicationFactor: 1
       - name: "theodolite-.*"
         removeOnly: True