Remove need for schema registry

...ication/src/main/java/uc4/application/HistoryService.java

...c/main/java/uc4/streamprocessing/KafkaStreamsBuilder.java

...pplication/src/main/java/uc4/streamprocessing/Serdes.java

...n/src/main/java/uc4/streamprocessing/TopologyBuilder.java