Chunk driver writes on Windows per-line

This is experimental. I think, ideally, we'll do this by finding an optimal
buffer size and writing based on that, but for the moment let's just try
line-by-line as that's easy.

This will be used to test against the tool I've made that lets me recreate
the issue documented in Textualize#2548; if this does the job we'll take this further.

src/textual/app.py

@@ -2526,7 +2526,12 @@ def _display(self, screen: Screen, renderable: RenderableType | None) -> None:
                     except Exception as error:
                         self._handle_exception(error)
                     else:
-                        self._driver.write(terminal_sequence)
+                        if WINDOWS:
+                            write = self._driver.write
+                            for line in terminal_sequence.split("\n"):
+                                write(line)
+                        else:
+                            self._driver.write(terminal_sequence)
                 finally:
                     self._end_update()