## What is the purpose of the change
[https://issues.apache.org/jira/browse/FLINK-10050](https://issues.apache.org/jira/browse/FLINK-10050)
Add 'allowedLateness' method to coGroup and join streams API.


## Brief change log

- add 'allowedLateness' for CoGroupedStreams/JoinedStreams java and scala API
- delegate calls to underlying WindowedStream (as for Trigger/Evictor scenario)


## Verifying this change

This change is a trivial rework.


## Does this pull request potentially affect one of the following parts:

  - Dependencies (does it add or upgrade a dependency): no
  - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: yes
  - The serializers: no
  - The runtime per-record code paths (performance sensitive): no
  - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
  - The S3 file system connector: no

## Documentation

  - Does this pull request introduce a new feature? no


[ Full content available at: https://github.com/apache/flink/pull/6646 ]
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