code cleaning after work for paper + restructuring requestMetrics

...rc/tools/descartes/dql/connector/kieker/KiekerHelper.java

...onnector/kieker/PerformanceMetricsQueryConnectorImpl.java

...scartes/dql/connector/kieker/filter/KiekerController.java

...cartes/dql/connector/kieker/filter/KiekerTraceLoader.java

...cartes/dql/connector/kieker/filter/UtilizationFilter.java

...ools/descartes/dql/connector/kieker/structures/Trace.java

...tor/kieker/structures/identifier/ComponentIdentifier.java