splitter: 1.1.2 - De-/Serialization are both using the default-serde

- Configured the default-serde for the expeced input and the intended output
- The configuration has to be supplied explicitly in the `Properties`,
  that are handed over during the instanciation of `KafkaStreams`.
- The `JsonDeserializer` needs the definition of a default-type for the
  value and position of trust for the class, that should be instanciated.
- The `JsonSerializer` should be advised to _not_ add the header
  `__TypeId__`, because it is not needed, if the topic only contains
  messages of a single type.