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Add support for the decimal logical type in Python AVRO

Add support for the decimal logical type in Python AVRO: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). The Avro spec defines a decimal logical type that annotates either a bytes or fixed schema with precision and scale properties — typically used for representing…

The task

The Avro spec defines a `decimal` logical type that annotates either a `bytes` or `fixed` schema with `precision` and `scale` properties — typically used for representing exact-precision values like monetary amounts. The Java implementation handles this, but the Python library currently has no real support for it.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.