[PR] Adds support for updating Schema state fields. [beam]

[via GitHub]

acrites opened a new pull request, #35229:
URL: https://github.com/apache/beam/pull/35229

   On the Dataflow runner we already populate the encoding positions fields of 
the schema proto whenever the pipeline is updated with changes to the schema. 
This correctly updates any schemas used as inputs/outputs to DoFn's. For the 
portable runner, we don't update the schemas used by persistent state fields 
however. These just use whatever schema is compiled in.
   
   So this PR factors out the code from the Dataflow runner that updates these 
schemas and reuses this code in the Java SDK.
   
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