Replace check_interval for JavaScript requests with asyncio event

[falkoschindler]

This PR solves one aspect of issue #2482 by replacing the 0.01s loop with asyncio events.

To verify everything is still working, I experimented with the following demo code:

def alert():
    ui.run_javascript('alert("Hello!")')

async def get_date():
    time = await ui.run_javascript('Date()')
    ui.notify(f'Browser time: {time}')

async def fail():
    await ui.run_javascript('fail()')

ui.button('fire and forget', on_click=alert)
ui.button('receive result', on_click=get_date)
ui.button('timeout', on_click=fail)

Note that I didn't mark every single method parameter as DEPRECATED. I only marked the root implementation, which is called by all derived methods. Similarly, I only added a warning once. I even removed a duplicate marker and a warning for the deprecated respond parameter.

[rodja]

I love it!