docs: add docs for langchain_scraperapi tool integration

[chaseleantj]

Adds documentation for the integration langchain-scraperapi, which contains 3 tools using the ScraperAPI service.

The tools give AI agents the ability to

1. Scrape the web and return HTML/text/markdown
2. Perform Google search and return json output
3. Perform Amazon search and return json output

For reference, here is the official repo for langchain_scraperapi: https://github.com/scraperapi/langchain-scraperapi

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 19, 2025 3:13pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #31675 will improve performances by 11.9%

_{Comparing scraperapi:master (93ffabc) with master (29e17fb)}

⚠️ 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

⚡ 1 improvements
✅ 12 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_import_time[tool]	505.6 ms	451.8 ms	+11.9%

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #31675 will not alter performance

_{Comparing scraperapi:master (93ffabc) with master (29e17fb)}

Summary

✅ 13 untouched benchmarks