community[minor]: add user agent for web scraping loaders (#22480)

**Description:** This PR adds a `USER_AGENT` env variable that is to be
used for web scraping. It creates a util to get that user agent and uses
it in the classes used for scraping in [this piece of
doc](https://python.langchain.com/v0.1/docs/use_cases/web_scraping/).
Identifying your scraper is considered a good politeness practice, this
PR aims at easing it.
**Issue:** `None`
**Dependencies:** `None`
**Twitter handle:** `None`

docs/docs/integrations/document_loaders/async_chromium.ipynb

@@ -48,7 +48,7 @@
     "from langchain_community.document_loaders import AsyncChromiumLoader\n",
     "\n",
     "urls = [\"https://www.wsj.com\"]\n",
-    "loader = AsyncChromiumLoader(urls)\n",
+    "loader = AsyncChromiumLoader(urls, user_agent=\"MyAppUserAgent\")\n",
     "docs = loader.load()\n",
     "docs[0].page_content[0:100]"
    ]