[GitHub] tzulitai opened a new pull request #7124: [FLINK-9574] [doc] Rework documentation for custom state serializers and state evolution

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tzulitai opened a new pull request #7124: [FLINK-9574] [doc]  Rework documentation for custom state serializers and state evolution
URL: https://github.com/apache/flink/pull/7124
 
 
   ## What is the purpose of the change
   
   This PR adds a new "State Schema Evolution" page under "State & Fault Tolerance".
   It also reworks the "Custom State Serialization" page to reflect the new serializer / serializer snapshot abstractions in 1.7.
   
   - The "State Schema Evolution" page is intended for the majority of users who do not use custom serializers, and just care about what state types they should use if they care about evolvable schema, and their limitations. The list of supported types only includes Avro now, because we only support Avro schema evolution in 1.7.
   - The "Custom State Serialization" page is intended for power users who implement their own state serializer. It explains the abstractions and how Flink interacts with them. The document is also targeted for Flink developers who might implement Flink-shipped serializers.
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (**yes** / no)
     - If yes, how is the feature documented? (not applicable / **docs** / JavaDocs / not documented)
   

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