feat(langchain): add tool, retriever E2E tests and changelog [5/5]#4454

nagkumar91 wants to merge 5 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-python-contrib:mainfrom

nagkumar91:langchain/pr5-tool-retriever-e2enagkumar91/opentelemetry-python-contrib:langchain/pr5-tool-retriever-e2eCopy head branch name to clipboard