Log exceptions in tool calls to match resource/prompt handlers

_handle_call_tool was silently catching exceptions and returning
CallToolResult(is_error=True) without any server-side logging.
The equivalent handlers for resources and prompts both call
logger.exception() in their error branches. Added the same logging
for tool calls so server operators can see tool execution failures.

Fixes #3266

Author: Sachin

src/mcp/server/mcpserver/server.py

@@ -422,6 +422,7 @@ async def _handle_call_tool(
         except MCPError:
             raise
         except Exception as e:
+            logger.exception(f"Error calling tool {params.name}")
             return CallToolResult(content=[TextContent(type="text", text=str(e))], is_error=True)
 
     async def _handle_list_resources(