pyTermTk: please provide a default nonblocking async input driver

eg based on select.select + os.read ( works fine already with nurses2/batgrl and Textual

for cases where sys.platform in ('emscripten','wasi') ( but not pyodide)

eg typical render task could look like :

import asyncio, select, os

if sys.platform in ("emscripten", "wasi"):
    async def main():
        # save cursor in case alt screen fails
        STDIN = sys.stdin.fileno()

        loop = asyncio.get_event_loop()
        try:
            while not loop.is_closed():
                await asyncio.sleep(0)  # or 0.016 if not using RequestAnimationFrame
                if select.select([STDIN], [], [], 0)[0]:
                    try:
                        payload = os.read(STDIN, 1024)
                        # await handle terminal stream, process events
                    except OSError:
                        continue

                # save cursor
                # render damaged screen zone.
                # restore cursor

        except asyncio.exceptions.CancelledError:
            print("Cancelled")
        except KeyboardInterrupt:
            print("KeyboardInterrupt")
        finally:
            pass
            # restore term, stop mouse reporting, restore cursor