chore: suppress lint for import issues

[huangrpablo]

Problem

Several files have imports inside methods that violate the PLC0415 linting rule:

• batched/batch_processor.py:197 - import asyncio inside acall() method
• batched/inference/model_batch_processor.py:134 - import asyncio inside acall() method
• batched/utils.py:189 - import diskcache inside AsyncDiskCache.__init__() method

Solution

Add # noqa: PLC0415 comments to suppress these specific violations. The imports remain in their current locations to preserve:

• Performance benefits of conditional importing
• Optional dependency handling for diskcache
• Async-only import requirements

Changes Made

• Add # noqa: PLC0415 to asyncio imports in acall() methods
• Add # noqa: PLC0415 to diskcache import in AsyncDiskCache.__init__()

Testing

• make lint passes without errors
• All existing tests continue to pass