Remove global torch import in llm_inference_utils.py

[B-Step62]

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Related Issues/PRs

Fix test failure

What changes are proposed in this pull request?

mlflow/transformers/llm_inference_utils.py imports Pytorch globally and caused import error for test environment where Pytorch is not installed. Indeed torch is only used for type annotation, so we can wrap it in TYPE_CHECKING so it won't be imported at runtime.

How is this PR tested?

• Existing unit/integration tests
• New unit/integration tests
• Manual tests

Langchain CI tests triggered by the dummy commit: https://github.com/mlflow/mlflow/actions/runs/7895154250/job/21547078167?pr=11115

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• No. You can skip the rest of this section.
• Yes. I've updated:
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[BenWilson2]

LGTM!