sijie opened a new pull request #2452: [Schema] Provide a generic record 
interface for representing a typed message
    ### Motivation
   In some use cases, the publishers and consumers don't know the type or 
schema of the messages ahead of time.
   For example, in pulsar io connector, when connecting a topic to a jdbc 
table, the connector doesn't know
   the tyep of the messages ahead of time; the connector can only fetch schema 
info from schema registry and
   that is the only information connector knows. It is impossible for mapping 
the messages to a relational database
   So we need a way to present a generic `Struct` record with fields.
    ### Changes
   Introduce `Field` and `GenericRecord` to represent `Struct` records 
deserialized with a schema.
    ### NotCovered
   This change only introduces the interfaces. It doesn't integrate with the 
producer and consumer workflow.
   That would be done in subsequent changes if we agree on the interfaces.

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