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/tools/playwright/get_elements.py

@@ -0,0 +1,111 @@
+from __future__ import annotations
+
+import json
+from typing import TYPE_CHECKING, List, Optional, Sequence, Type
+
+from langchain_core.callbacks import (
+    AsyncCallbackManagerForToolRun,
+    CallbackManagerForToolRun,
+)
+from langchain_core.pydantic_v1 import BaseModel, Field
+
+from langchain_community.tools.playwright.base import BaseBrowserTool
+from langchain_community.tools.playwright.utils import (
+    aget_current_page,
+    get_current_page,
+)
+
+if TYPE_CHECKING:
+    from playwright.async_api import Page as AsyncPage
+    from playwright.sync_api import Page as SyncPage
+
+
+class GetElementsToolInput(BaseModel):
+    """Input for GetElementsTool."""
+
+    selector: str = Field(
+        ...,
+        description="CSS selector, such as '*', 'div', 'p', 'a', #id, .classname",
+    )
+    attributes: List[str] = Field(
+        default_factory=lambda: ["innerText"],
+        description="Set of attributes to retrieve for each element",
+    )
+
+
+async def _aget_elements(
+    page: AsyncPage, selector: str, attributes: Sequence[str]
+) -> List[dict]:
+    """Get elements matching the given CSS selector."""
+    elements = await page.query_selector_all(selector)
+    results = []
+    for element in elements:
+        result = {}
+        for attribute in attributes:
+            if attribute == "innerText":
+                val: Optional[str] = await element.inner_text()
+            else:
+                val = await element.get_attribute(attribute)
+            if val is not None and val.strip() != "":
+                result[attribute] = val
+        if result:
+            results.append(result)
+    return results
+
+
+def _get_elements(
+    page: SyncPage, selector: str, attributes: Sequence[str]
+) -> List[dict]:
+    """Get elements matching the given CSS selector."""
+    elements = page.query_selector_all(selector)
+    results = []
+    for element in elements:
+        result = {}
+        for attribute in attributes:
+            if attribute == "innerText":
+                val: Optional[str] = element.inner_text()
+            else:
+                val = element.get_attribute(attribute)
+            if val is not None and val.strip() != "":
+                result[attribute] = val
+        if result:
+            results.append(result)
+    return results
+
+
+class GetElementsTool(BaseBrowserTool):
+    """Tool for getting elements in the current web page matching a CSS selector."""
+
+    name: str = "get_elements"
+    description: str = (
+        "Retrieve elements in the current web page matching the given CSS selector"
+    )
+    args_schema: Type[BaseModel] = GetElementsToolInput
+
+    def _run(
+        self,
+        selector: str,
+        attributes: Sequence[str] = ["innerText"],
+        run_manager: Optional[CallbackManagerForToolRun] = None,
+    ) -> str:
+        """Use the tool."""
+        if self.sync_browser is None:
+            raise ValueError(f"Synchronous browser not provided to {self.name}")
+        page = get_current_page(self.sync_browser)
+        # Navigate to the desired webpage before using this tool
+        results = _get_elements(page, selector, attributes)
+        return json.dumps(results, ensure_ascii=False)
+
+    async def _arun(
+        self,
+        selector: str,
+        attributes: Sequence[str] = ["innerText"],
+        run_manager: Optional[AsyncCallbackManagerForToolRun] = None,
+    ) -> str:
+        """Use the tool."""
+        if self.async_browser is None:
+            raise ValueError(f"Asynchronous browser not provided to {self.name}")
+        page = await aget_current_page(self.async_browser)
+        # Navigate to the desired webpage before using this tool
+        results = await _aget_elements(page, selector, attributes)
+        return json.dumps(results, ensure_ascii=False)