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Introduce Execution Hint for Process Function

It's hard for people to understand which functions are batch-stream unified and which are batch / stream dedicated. We want to introduce a hint to identify the type of function in DataStream API V2. This not only helps users, but also helps the engine work better. For example, for batch only functions, more aggressively optimize can be done in runtime level.
We will discuss this section in a separate FLIP, mainly including:

  • Introducing execution hint mechanism for DataStream API V2.

  • How to mark this hint for

    buit

    built-in functions as well as user defined functions.

  • What other helpful hints can be provided in the future.

DataStream API V2's Support for Event Time

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