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/utilities/openweathermap.py

@@ -0,0 +1,76 @@
+"""Util that calls OpenWeatherMap using PyOWM."""
+from typing import Any, Dict, Optional
+
+from langchain_core.pydantic_v1 import BaseModel, Extra, root_validator
+from langchain_core.utils import get_from_dict_or_env
+
+
+class OpenWeatherMapAPIWrapper(BaseModel):
+    """Wrapper for OpenWeatherMap API using PyOWM.
+
+    Docs for using:
+
+    1. Go to OpenWeatherMap and sign up for an API key
+    2. Save your API KEY into OPENWEATHERMAP_API_KEY env variable
+    3. pip install pyowm
+    """
+
+    owm: Any
+    openweathermap_api_key: Optional[str] = None
+
+    class Config:
+        """Configuration for this pydantic object."""
+
+        extra = Extra.forbid
+
+    @root_validator(pre=True)
+    def validate_environment(cls, values: Dict) -> Dict:
+        """Validate that api key exists in environment."""
+        openweathermap_api_key = get_from_dict_or_env(
+            values, "openweathermap_api_key", "OPENWEATHERMAP_API_KEY"
+        )
+
+        try:
+            import pyowm
+
+        except ImportError:
+            raise ImportError(
+                "pyowm is not installed. Please install it with `pip install pyowm`"
+            )
+
+        owm = pyowm.OWM(openweathermap_api_key)
+        values["owm"] = owm
+
+        return values
+
+    def _format_weather_info(self, location: str, w: Any) -> str:
+        detailed_status = w.detailed_status
+        wind = w.wind()
+        humidity = w.humidity
+        temperature = w.temperature("celsius")
+        rain = w.rain
+        heat_index = w.heat_index
+        clouds = w.clouds
+
+        return (
+            f"In {location}, the current weather is as follows:\n"
+            f"Detailed status: {detailed_status}\n"
+            f"Wind speed: {wind['speed']} m/s, direction: {wind['deg']}°\n"
+            f"Humidity: {humidity}%\n"
+            f"Temperature: \n"
+            f"  - Current: {temperature['temp']}°C\n"
+            f"  - High: {temperature['temp_max']}°C\n"
+            f"  - Low: {temperature['temp_min']}°C\n"
+            f"  - Feels like: {temperature['feels_like']}°C\n"
+            f"Rain: {rain}\n"
+            f"Heat index: {heat_index}\n"
+            f"Cloud cover: {clouds}%"
+        )
+
+    def run(self, location: str) -> str:
+        """Get the current weather information for a specified location."""
+        mgr = self.owm.weather_manager()
+        observation = mgr.weather_at_place(location)
+        w = observation.weather
+
+        return self._format_weather_info(location, w)