Add warning log for process termination

Author: Mazyod

lsp_types/process.py

@@ -136,6 +136,7 @@ async def stop(self) -> None:
                     logger.warning("Server exited with return code: %d", return_code)
             except asyncio.TimeoutError:
                 try:
+                    logger.warning("Killing process")
                     self._process.kill()
                 except ProcessLookupError:
                     pass