community[minor]: Add Datahareld tool (#19680)

**Description:** Integrate [dataherald](https://www.dataherald.com)
tool, It is a natural language-to-SQL tool.
**Dependencies:** Install dataherald sdk to use it,
```
pip install dataherald
```

---------

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Christophe Bornet <cbornet@hotmail.com>

libs/community/langchain_community/tools/dataherald/tool.py

@@ -0,0 +1,36 @@
+"""Tool for the Dataherald Hosted API"""
+
+from typing import Optional, Type
+
+from langchain_core.callbacks import CallbackManagerForToolRun
+from langchain_core.pydantic_v1 import BaseModel, Field
+from langchain_core.tools import BaseTool
+
+from langchain_community.utilities.dataherald import DataheraldAPIWrapper
+
+
+class DataheraldTextToSQLInput(BaseModel):
+    prompt: str = Field(
+        description="Natural language query to be translated to a SQL query."
+    )
+
+
+class DataheraldTextToSQL(BaseTool):
+    """Tool that queries using the Dataherald SDK."""
+
+    name: str = "dataherald"
+    description: str = (
+        "A wrapper around Dataherald. "
+        "Text to SQL. "
+        "Input should be a prompt and an existing db_connection_id"
+    )
+    api_wrapper: DataheraldAPIWrapper
+    args_schema: Type[BaseModel] = DataheraldTextToSQLInput
+
+    def _run(
+        self,
+        prompt: str,
+        run_manager: Optional[CallbackManagerForToolRun] = None,
+    ) -> str:
+        """Use the Dataherald tool."""
+        return self.api_wrapper.run(prompt)