[FLINK-6857] [types] Add global default Kryo serializer configuration…

[rice668]

… to StreamExecutionEnvironment

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[tzulitai]

@zhangminglei this does not solve the issue.
The expected fix is to pass the new setting to ExecutionConfig, which will then be used when creating a KryoSerializer (see GenericTypeInfo). The KryoSerializer needs to respect this setting and appropriately configure the kryo instance when instantiating it.

[rice668]

@tzulitai Sorry for delay. What you mean is that I should first implement or support Kryo.setDefaultSerializer(...) method in ExecutionConfig, and that is the solution for this issue. I understand right ? If I am wrong, please helps me out. Thank you !