Fix some code quality issues in UC4

.../uc4-application-flink/.settings/org.eclipse.jdt.ui.prefs

...heodolite/uc4/application/AggregationServiceFlinkJob.java

...eodolite/uc4/application/ChildParentsFlatMapFunction.java

...in/java/theodolite/uc4/application/ConfigurationKeys.java

...te/uc4/application/JoinAndDuplicateCoFlatMapFunction.java

...cation/JoinAndDuplicateKeyedBroadcastProcessFunction.java

...4/application/RecordAggregationProcessWindowFunction.java

...4/application/util/ImmutableSensorRegistrySerializer.java

...eodolite/uc4/application/util/ImmutableSetSerializer.java

...java/theodolite/uc4/application/util/SensorParentKey.java

...olite/uc4/application/util/SensorParentKeySerializer.java