fix LlamaIndex streaming response import

[sfc-gh-chu]

Description

Please include a summary of the changes and the related issue that can be inlcuded in the release announcement. Please also include relevant motivation and context. Fixes import for StreamingResponse

Other details good to know for developers

Please include any other details of this change useful for TruLens developers.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

[sfc-gh-chu]

@sfc-gh-pmardziel do you know of any way to catch broken optional imports like these in our pipeline?

[sfc-gh-jreini]

Nonblocker: can we add clear statements in the docs for cases where we do/don't support streaming?

Can we also investigate the async/streaming notebooks and fix if they don't work or remove if no longer supported?

• https://github.com/truera/trulens/blob/main/trulens_eval/examples/expositional/frameworks/langchain/langchain_async.ipynb

• https://github.com/truera/trulens/blob/main/trulens_eval/examples/expositional/frameworks/langchain/langchain_async.ipynb