[FLINK-3367] Add PublicEvolving and Internal annotations to classes in API modules #1606
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This PR includes the commit from #1599.
It adds annotations to all classes in the following modules:
flink-core
flink-java
flink-scala
flink-streaming-java
flink-streaming-scala
By adding annotations to every class, annotation management becomes easier and we can enforce annotations for all new classes in our API modules.