Streaming prototype update

Enhanced CoFunction and connectors functionality, refactored examples. Several minor bugfixes.
You are adding these dependencies to the LICENSE file, which ends up in the source distribution.

You probably want to put them into the DEPENDENCIES file? and as well into the `flink-dist/src/main/flink-bin/` directory?
@StephanEwen is our expert on crafting license files ;) Ask him if in doubt