Add UC2 (fka UC3)

theodolite-benchmarks/settings.gradle

.../uc2-application-flink/.settings/org.eclipse.jdt.ui.prefs

...cation-flink/.settings/qa.eclipse.plugin.checkstyle.prefs

...2-application-flink/.settings/qa.eclipse.plugin.pmd.prefs

theodolite-benchmarks/uc2-application-flink/Dockerfile

theodolite-benchmarks/uc2-application-flink/build.gradle

...in/java/theodolite/uc2/application/ConfigurationKeys.java

...va/theodolite/uc2/application/HistoryServiceFlinkJob.java

...va/theodolite/uc2/application/StatsAggregateFunction.java

...heodolite/uc2/application/StatsProcessWindowFunction.java

...in/java/theodolite/uc2/application/util/StatsFactory.java

...-flink/src/main/resources/META-INF/application.properties