community[minor]: Add Scrapfly Loader community integration (#22036)

Added [Scrapfly](https://scrapfly.io/) Web Loader integration. Scrapfly
is a web scraping API that allows extracting web page data into
accessible markdown or text datasets.

- __Description__: Added Scrapfly web loader for retrieving web page
data as markdown or text.
- Dependencies: scrapfly-sdk
- Twitter: @thealchemi1st

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/docs/integrations/document_loaders/scrapfly.ipynb

@@ -0,0 +1,107 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## ScrapFly\n",
+    "[ScrapFly](https://scrapfly.io/) is a web scraping API with headless browser capabilities, proxies, and anti-bot bypass. It allows for extracting web page data into accessible LLM markdown or text."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#### Installation\n",
+    "Install ScrapFly Python SDK and he required Langchain packages using pip:\n",
+    "```shell\n",
+    "pip install scrapfly-sdk langchain langchain-community\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#### Usage"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain_community.document_loaders import ScrapflyLoader\n",
+    "\n",
+    "scrapfly_loader = ScrapflyLoader(\n",
+    "    [\"https://web-scraping.dev/products\"],\n",
+    "    api_key=\"Your ScrapFly API key\",  # Get your API key from https://www.scrapfly.io/\n",
+    "    ignore_scrape_failures=True,  # Ignore unprocessable web pages and log their exceptions\n",
+    ")\n",
+    "\n",
+    "# Load documents from URLs as markdown\n",
+    "documents = scrapfly_loader.load()\n",
+    "print(documents)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "The ScrapflyLoader also allows passigng ScrapeConfig object for customizing the scrape request. See the documentation for the full feature details and their API params: https://scrapfly.io/docs/scrape-api/getting-started"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain_community.document_loaders import ScrapflyLoader\n",
+    "\n",
+    "scrapfly_scrape_config = {\n",
+    "    \"asp\": True,  # Bypass scraping blocking and antibot solutions, like Cloudflare\n",
+    "    \"render_js\": True,  # Enable JavaScript rendering with a cloud headless browser\n",
+    "    \"proxy_pool\": \"public_residential_pool\",  # Select a proxy pool (datacenter or residnetial)\n",
+    "    \"country\": \"us\",  # Select a proxy location\n",
+    "    \"auto_scroll\": True,  # Auto scroll the page\n",
+    "    \"js\": \"\",  # Execute custom JavaScript code by the headless browser\n",
+    "}\n",
+    "\n",
+    "scrapfly_loader = ScrapflyLoader(\n",
+    "    [\"https://web-scraping.dev/products\"],\n",
+    "    api_key=\"Your ScrapFly API key\",  # Get your API key from https://www.scrapfly.io/\n",
+    "    ignore_scrape_failures=True,  # Ignore unprocessable web pages and log their exceptions\n",
+    "    scrape_config=scrapfly_scrape_config,  # Pass the scrape_config object\n",
+    "    scrape_format=\"markdown\",  # The scrape result format, either `markdown`(default) or `text`\n",
+    ")\n",
+    "\n",
+    "# Load documents from URLs as markdown\n",
+    "documents = scrapfly_loader.load()\n",
+    "print(documents)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}