[PR] Add Async Dofn and Test to BEAM [beam]

[via GitHub]

dustin12 opened a new pull request, #35245:
URL: https://github.com/apache/beam/pull/35245

   Adds Async Dofns and their tests to BEAM.
   
   Meant to be used in cases where processing is long and we don't want to 
block the GetWork/CommitWork streams waiting for the processing to finish 
synchronously.  Instead we buffer the item into state, add it to a queue, and 
commit the result when the item is finished using state and timers.
   
   Takes a standard Dofn as input and does the dofns work asynchronously.
   
   ------------------------
   
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