[wbarnha]

Summary

• Start transactional producers only for newly assigned partitions during rebalance.
• Retained partitions keep their active transaction instead of calling begin_transaction a second time.
• Extend transaction-manager coverage to include a retained assigned partition.

Addresses #323.

Validation

• tests/unit/transport/test_consumer.py: passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.20%. Comparing base (3442a90) to head (9c438c2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #800   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files         110      110           
  Lines       11791    11791           
  Branches     1282     1282           
=======================================
  Hits        11343    11343           
  Misses        351      351           
  Partials       97       97           

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