Update serper_dev_tool.py

Added two additional functionalities:

1) added the ability to save the server results to a file
2) added the ability to  set the number of results returned

Can be used as follows:

serper_tool = SerperDevTool(file_save=True, n_results=20)

src/crewai_tools/tools/serper_dev_tool/serper_dev_tool.py

@@ -6,6 +6,14 @@ from typing import Type, Any
 from pydantic.v1 import BaseModel, Field
 from crewai_tools.tools.base_tool import BaseTool
 
+def _save_results_to_file(content: str) -> None:
+    """Saves the search results to a file."""
+    filename = f"search_results_{datetime.now().strftime('%Y-%m-%d_%H-%M-%S')}.txt"
+    with open(filename, 'w') as file:
+        file.write(content)
+    print(f"Results saved to {filename}")
+
+
 class SerperDevToolSchema(BaseModel):
 	"""Input for SerperDevTool."""
 	search_query: str = Field(..., description="Mandatory search query you want to use to search the internet")
@@ -15,17 +23,22 @@ class SerperDevTool(BaseTool):
 	description: str = "A tool that can be used to search the internet with a search_query."
 	args_schema: Type[BaseModel] = SerperDevToolSchema
 	search_url: str = "https://google.serper.dev/search"
-	n_results: int = 10
+	n_results: int = Field(default=10, description="Number of search results to return")
+    	save_file: bool = Field(default=False, description="Flag to determine whether to save the results to a file")
 
 	def _run(
 		self,
 		**kwargs: Any,
 	) -> Any:
+		save_file = kwargs.get('save_file', self.save_file)
+	
+	        n_results = kwargs.get('n_results', self.n_results)
+
 		search_query = kwargs.get('search_query')
 		if search_query is None:
 			search_query = kwargs.get('query')
 
-		payload = json.dumps({"q": search_query})
+		payload = json.dumps({"q": search_query, "num": n_results})
 		headers = {
 				'X-API-KEY': os.environ['SERPER_API_KEY'],
 				'content-type': 'application/json'
@@ -47,6 +60,8 @@ class SerperDevTool(BaseTool):
 					next
 
 			content = '\n'.join(string)
+			if save_file:
+                		_save_results_to_file(content)
 			return f"\nSearch results: {content}\n"
 		else:
 			return results