feat: Migrate langchain functionality into braintrust package#150

Abhijeet Prasad (AbhiPrasad) merged 15 commits into

mainbraintrustdata/braintrust-sdk-python:mainfrom

cedric/migrate-langchain-into-braintrust-pkg-without-auto-instrumentationbraintrustdata/braintrust-sdk-python:cedric/migrate-langchain-into-braintrust-pkg-without-auto-instrumentationCopy head branch name to clipboard