Switch to chunking Windows terminal sequences based on buffer size

First we tested this by splitting the output by lines; that worked but it
could be faster. So now we're going to take the problematic buffer
size (32KiB), assume a reasonable worst case of every character heading out
being 3 bytes in size, and chunking the output based on that.

In other words, experiment for #2548 take two.

src/textual/app.py

@@ -2527,9 +2527,19 @@ def _display(self, screen: Screen, renderable: RenderableType | None) -> None:
                         self._handle_exception(error)
                     else:
                         if WINDOWS:
+                            # Combat a problem with Python on Windows.
+                            #
+                            # https://github.com/Textualize/textual/issues/2548
+                            # https://github.com/python/cpython/issues/82052
+                            CHUNK_SIZE = 8192
                             write = self._driver.write
-                            for line in terminal_sequence.split("\n"):
-                                write(line)
+                            for chunk in (
+                                terminal_sequence[offset : offset + CHUNK_SIZE]
+                                for offset in range(
+                                    0, len(terminal_sequence), CHUNK_SIZE
+                                )
+                            ):
+                                write(chunk)
                         else:
                             self._driver.write(terminal_sequence)
                 finally: