feat: Migrate langchain functionality into braintrust package

[Cedric / ViaDézo1er (viadezo1er)]

Fix #27

Migrates braintrust-langchain to the main braintrust python pkg.

Migration Guide: braintrust-langchain to braintrust

Before

pip install braintrust-langchain

from braintrust_langchain import BraintrustCallbackHandler, set_global_handler
handler = BraintrustCallbackHandler()
set_global_handler(handler)

After

pip install braintrust

from braintrust.integrations.langchain import BraintrustCallbackHandler, set_global_handler

What to update

• Change imports from braintrust_langchain to braintrust.integrations.langchain
• Remove braintrust-langchain from your dependencies — braintrust now includes LangChain support with no extra package

Coming soon

Auto-instrumentation support for the langchain integration

[Abhijeet Prasad (AbhiPrasad)]

Can we use git mv on the code in https://github.com/braintrustdata/braintrust-sdk-python/tree/main/integrations/langchain-py/src/braintrust_langchain? That way we maintain git history for the moved files.

We can do the same thing we did in adk-py, and just leave a deprecation warning + move the files https://github.com/braintrustdata/braintrust-sdk-python/blob/main/integrations/adk-py/src/braintrust_adk/__init__.py

[Abhijeet Prasad (AbhiPrasad)]

Removing BraintrustTracer is a breaking change. We can do this, but I would prefer not to do it. Instead let's leave a note at the top of the file that braintrust.integrations.langchain is the new import, and update the _logger.warning in BraintrustTracer to have the new deprecation.

[Cedric / ViaDézo1er (viadezo1er)]

Rebasing against main

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	braintrust@​0.2.9 ⏵ 0.11.0	-22
	langchain-core@​1.2.8
	jsonschema@​4.26.0
	langchain-anthropic@​0.3.22
	langchain-anthropic@​1.3.1
	langchain-openai@​0.3.35
	langchain-openai@​1.1.7
	langchain-core@​0.3.83

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