docs: add langchain-scraperapi (#31973)

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

The tools give AI agents the ability to

Scrape the web and return HTML/text/markdown
Perform Google search and return json output
Perform Amazon search and return json output

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

Author: chaseleantj

docs/docs/integrations/providers/scraperapi.ipynb

@@ -0,0 +1,72 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# ScraperAPI\n",
+    "\n",
+    "[ScraperAPI](https://www.scraperapi.com/) enables data collection from any public website with its web scraping API, without worrying about proxies, browsers, or CAPTCHA handling. [langchain-scraperapi](https://github.com/scraperapi/langchain-scraperapi) wraps this service, making it easy for AI agents to browse the web and scrape data from it.\n",
+    "\n",
+    "## Installation and Setup\n",
+    "\n",
+    "- Install the Python package with `pip install langchain-scraperapi`.\n",
+    "- Obtain an API key from [ScraperAPI](https://www.scraperapi.com/) and set the environment variable `SCRAPERAPI_API_KEY`.\n",
+    "\n",
+    "### Tools\n",
+    "\n",
+    "The package offers 3 tools to scrape any website, get structured Google search results, and get structured Amazon search results respectively.\n",
+    "\n",
+    "To import them:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%pip install langchain_scraperapi\n",
+    "\n",
+    "from langchain_scraperapi.tools import (\n",
+    "    ScraperAPIAmazonSearchTool,\n",
+    "    ScraperAPIGoogleSearchTool,\n",
+    "    ScraperAPITool,\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Example use:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "tool = ScraperAPITool()\n",
+    "\n",
+    "result = tool.invoke({\"url\": \"https://example.com\", \"output_format\": \"markdown\"})\n",
+    "print(result)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "For a more detailed walkthrough of how to use these tools, visit the [official repository](https://github.com/scraperapi/langchain-scraperapi)."
+   ]
+  }
+ ],
+ "metadata": {
+  "language_info": {
+   "name": "python"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}