community: Add PolygonTickerNews Tool (#17808)

Description:
In this PR, I am adding a PolygonTickerNews Tool, which can be used to
get the latest news for a given ticker / stock.

Twitter handle: [@virattt](https://twitter.com/virattt)

libs/community/langchain_community/tools/polygon/ticker_news.py

@@ -0,0 +1,36 @@
+from typing import Optional, Type
+
+from langchain_core.callbacks import CallbackManagerForToolRun
+from langchain_core.pydantic_v1 import BaseModel
+from langchain_core.tools import BaseTool
+
+from langchain_community.utilities.polygon import PolygonAPIWrapper
+
+
+class Inputs(BaseModel):
+    """Inputs for Polygon's Ticker News API"""
+
+    query: str
+
+
+class PolygonTickerNews(BaseTool):
+    """Tool that gets the latest news for a given ticker from Polygon"""
+
+    mode: str = "get_ticker_news"
+    name: str = "polygon_ticker_news"
+    description: str = (
+        "A wrapper around Polygon's Ticker News API. "
+        "This tool is useful for fetching the latest news for a stock. "
+        "Input should be the ticker that you want to get the latest news for."
+    )
+    args_schema: Type[BaseModel] = Inputs
+
+    api_wrapper: PolygonAPIWrapper
+
+    def _run(
+        self,
+        query: str,
+        run_manager: Optional[CallbackManagerForToolRun] = None,
+    ) -> str:
+        """Use the Polygon API tool."""
+        return self.api_wrapper.run(self.mode, ticker=query)