LangChain instrumentation via LangSmith

[alexmojaki]

Adds processing for spans produced by LangSmith's OTel tracing to work better in Logfire.

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[hyperlint-ai]

PR Change Summary

Added documentation for integrating LangChain with Logfire using OpenTelemetry tracing.

• Introduced a new section on LangChain integration with Logfire.
• Provided example code for setting up OpenTelemetry tracing with LangChain.
• Included a visual representation of the trace in Logfire.

Added Files

• docs/integrations/llms/langchain.md

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