StreamWriter should not require destination as constructor argument

[kevinwallimann]

Description
Currently, the StreamWriter requires a destination as a constructor argument. However, e.g. writing to Kafka does not require a destination, but rather a topic.

Tasks

• Remove the constructor argument destination from StreamWriter
• Remove the default implementation of StreamWriter.getDestination and implement it in the derived classes.
• Update archetype

Consequences

• Currently, the destination directory is removed if the ingestion fails and the directory has been empty before the ingestion. This functionality assumes that the getDestination method of the StreamWriter returns a path on hdfs. However, this cannot be guaranteed. getDestination may return any string and it can't be assumed that it signifies a path.
  The functionality is not very useful in practice since the destination folder is empty only at the very first ingestion. Therefore, this functionality will be removed.

How to migrate

• External components implementing StreamWriter need to remove the destination parameter from the constructor to the superclass, i.e. replace extends StreamWriter(destination) with extends StreamWriter
• No configuration properties need to be changed