huggingface: add astream for huggingface pipeline

[nazeudon]

Description

Adds async streaming support to HuggingFacePipeline via a new _astream method. ChatHuggingFace now also supports async streaming by following this update. Both implementations closely follow the structure of the existing stream methods.

Issue

none (as long as I am aware)

Dependencies

none

tests and docs

• Added a test for HuggingFacePipeline's new _astream method

Lint and test

• make format
• make lint
• make test

Additional guidelines:

• Make sure optional dependencies are imported within a function.
• Please do not add dependencies to pyproject.toml files (even optional ones) unless they are required for unit tests.
• Most PRs should not touch more than one package.
• Changes should be backwards compatible.

If no one reviews your PR within a few days, please @-mention one of baskaryan, eyurtsev, ccurme, vbarda, hwchase17.

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)	Visit Preview		Jun 12, 2025 7:47am

[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #31575 will not alter performance

_{Comparing nazeudon:hf_pipeline_astream (1c589da) with master (446a9d5)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #31575 will not alter performance

_{Comparing nazeudon:hf_pipeline_astream (1c589da) with master (446a9d5)}

Summary

✅ 13 untouched benchmarks