community[major], core[patch], langchain[patch], experimental[patch]: Create langchain-community (#14463)

Moved the following modules to new package langchain-community in a backwards compatible fashion:

```
mv langchain/langchain/adapters community/langchain_community
mv langchain/langchain/callbacks community/langchain_community/callbacks
mv langchain/langchain/chat_loaders community/langchain_community
mv langchain/langchain/chat_models community/langchain_community
mv langchain/langchain/document_loaders community/langchain_community
mv langchain/langchain/docstore community/langchain_community
mv langchain/langchain/document_transformers community/langchain_community
mv langchain/langchain/embeddings community/langchain_community
mv langchain/langchain/graphs community/langchain_community
mv langchain/langchain/llms community/langchain_community
mv langchain/langchain/memory/chat_message_histories community/langchain_community
mv langchain/langchain/retrievers community/langchain_community
mv langchain/langchain/storage community/langchain_community
mv langchain/langchain/tools community/langchain_community
mv langchain/langchain/utilities community/langchain_community
mv langchain/langchain/vectorstores community/langchain_community
mv langchain/langchain/agents/agent_toolkits community/langchain_community
mv langchain/langchain/cache.py community/langchain_community
mv langchain/langchain/adapters community/langchain_community
mv langchain/langchain/callbacks community/langchain_community/callbacks
mv langchain/langchain/chat_loaders community/langchain_community
mv langchain/langchain/chat_models community/langchain_community
mv langchain/langchain/document_loaders community/langchain_community
mv langchain/langchain/docstore community/langchain_community
mv langchain/langchain/document_transformers community/langchain_community
mv langchain/langchain/embeddings community/langchain_community
mv langchain/langchain/graphs community/langchain_community
mv langchain/langchain/llms community/langchain_community
mv langchain/langchain/memory/chat_message_histories community/langchain_community
mv langchain/langchain/retrievers community/langchain_community
mv langchain/langchain/storage community/langchain_community
mv langchain/langchain/tools community/langchain_community
mv langchain/langchain/utilities community/langchain_community
mv langchain/langchain/vectorstores community/langchain_community
mv langchain/langchain/agents/agent_toolkits community/langchain_community
mv langchain/langchain/cache.py community/langchain_community
```

Moved the following to core
```
mv langchain/langchain/utils/json_schema.py core/langchain_core/utils
mv langchain/langchain/utils/html.py core/langchain_core/utils
mv langchain/langchain/utils/strings.py core/langchain_core/utils
cat langchain/langchain/utils/env.py >> core/langchain_core/utils/env.py
rm langchain/langchain/utils/env.py
```

See .scripts/community_split/script_integrations.sh for all changes

libs/community/langchain_community/document_loaders/chromium.py

@@ -0,0 +1,91 @@
+import asyncio
+import logging
+from typing import Iterator, List
+
+from langchain_core.documents import Document
+
+from langchain_community.document_loaders.base import BaseLoader
+
+logger = logging.getLogger(__name__)
+
+
+class AsyncChromiumLoader(BaseLoader):
+    """Scrape HTML pages from URLs using a
+    headless instance of the Chromium."""
+
+    def __init__(
+        self,
+        urls: List[str],
+    ):
+        """
+        Initialize the loader with a list of URL paths.
+
+        Args:
+            urls (List[str]): A list of URLs to scrape content from.
+
+        Raises:
+            ImportError: If the required 'playwright' package is not installed.
+        """
+        self.urls = urls
+
+        try:
+            import playwright  # noqa: F401
+        except ImportError:
+            raise ImportError(
+                "playwright is required for AsyncChromiumLoader. "
+                "Please install it with `pip install playwright`."
+            )
+
+    async def ascrape_playwright(self, url: str) -> str:
+        """
+        Asynchronously scrape the content of a given URL using Playwright's async API.
+
+        Args:
+            url (str): The URL to scrape.
+
+        Returns:
+            str: The scraped HTML content or an error message if an exception occurs.
+
+        """
+        from playwright.async_api import async_playwright
+
+        logger.info("Starting scraping...")
+        results = ""
+        async with async_playwright() as p:
+            browser = await p.chromium.launch(headless=True)
+            try:
+                page = await browser.new_page()
+                await page.goto(url)
+                results = await page.content()  # Simply get the HTML content
+                logger.info("Content scraped")
+            except Exception as e:
+                results = f"Error: {e}"
+            await browser.close()
+        return results
+
+    def lazy_load(self) -> Iterator[Document]:
+        """
+        Lazily load text content from the provided URLs.
+
+        This method yields Documents one at a time as they're scraped,
+        instead of waiting to scrape all URLs before returning.
+
+        Yields:
+            Document: The scraped content encapsulated within a Document object.
+
+        """
+        for url in self.urls:
+            html_content = asyncio.run(self.ascrape_playwright(url))
+            metadata = {"source": url}
+            yield Document(page_content=html_content, metadata=metadata)
+
+    def load(self) -> List[Document]:
+        """
+        Load and return all Documents from the provided URLs.
+
+        Returns:
+            List[Document]: A list of Document objects
+            containing the scraped content from each URL.
+
+        """
+        return list(self.lazy_load())