docs: add ZenRows provider and tool integration

[Yuvrajchandra]

Description: Adds comprehensive documentation for ZenRows integration with LangChain, including provider overview and detailed tool documentation. ZenRows is an enterprise-grade web scraping solution that enables LangChain agents to extract web content at scale with advanced features like JavaScript rendering, anti-bot bypass, geo-targeting, and multiple output formats.

This PR includes:

• Provider documentation (docs/docs/integrations/providers/zenrows.ipynb)
• Tool documentation (docs/docs/integrations/tools/zenrows_universal_scraper.ipynb)
• Complete usage examples and API reference links

Issue: N/A

Dependencies:

• langchain-zenrows package (external, available on PyPI)
• No changes to core LangChain dependencies

LinkedIn handle: https://www.linkedin.com/company/zenrows/

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Name	Status	Preview	Comments	Updated (UTC)
langchain	❌ Failed (Inspect)			Jun 18, 2025 0:52am

[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #31648 will not alter performance

_{Comparing Yuvrajchandra:add-zenrows-integration (bcada5c) with master (a799988)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #31648 will not alter performance

_{Comparing Yuvrajchandra:add-zenrows-integration (bcada5c) with master (a799988)}

Summary

✅ 13 untouched benchmarks