docs: add prompt linking to langchain runs

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Name	Status	Preview	Updated (UTC)
langfuse-docs	✅ Ready (Inspect)	Visit Preview	Sep 17, 2024 9:28am

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📦 Next.js Bundle Analysis for langfuse-docs

This analysis was generated by the Next.js Bundle Analysis action. 🤖

Five Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/docs/prompts/example-langchain	8.2 KB	371.49 KB	106.14% (🟡 +0.02%)
/docs/prompts/example-langchain-js	7.76 KB	371.05 KB	106.01% (🟡 +0.02%)
/docs/prompts/get-started	17.02 KB	380.31 KB	108.66% (🟡 +0.18%)
/guides/cookbook/js_prompt_management_langchain	7.75 KB	371.04 KB	106.01% (🟡 +0.02%)
/guides/cookbook/prompt_management_langchain	8.22 KB	371.51 KB	106.15% (🟡 +0.02%)

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PR Summary

This pull request enhances the integration between Langfuse Prompt Management and Langchain by adding functionality to link Langfuse prompts with Langchain runs in both Python and JavaScript/TypeScript.

• Adds metadata containing the Langfuse prompt to Langchain PromptTemplates for automatic linking of generations
• Updates documentation and example files to demonstrate the new linking feature in both Python and JS/TS
• Removes LangChain from the list of integrations where prompt linking is unavailable in the main documentation
• Improves traceability by allowing generations using specific prompts to be tracked in Langfuse
• Updates both Jupyter notebooks and Markdown files to reflect the new functionality consistently across the documentation

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