Fix Python 3.9 compatibility by adding future annotations #7
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Add 'from future import annotations' to eigen_memory.py,
eigen_transformer.py, and eigen_attention.py to support Python 3.9.
The pipe union syntax (e.g., str | torch.device | None) is only
available in Python 3.10+. Using future annotations allows this
syntax to work in Python 3.9 by deferring type annotation evaluation.
This fixes the TypeError during test collection in the CI pipeline
running pytest on macOS with Python 3.9.