Adding debounce to `self.param.update`

I would like a built-in mechanism in the `self.param.update` method (or similar) that supports debouncing. https://www.geeksforgeeks.org/debouncing-in-javascript/

Example:
1. The code waits for 2 seconds before showing the loading icon.
2. If the process completes or the event resolves within those 2 seconds, the icon is never shown.
3. If the process doesn't complete, the icon appears after the delay, signaling that something is still loading.

This feature could be particularly useful for applications with frequent, rapid user interactions that trigger parameter updates (e.g., sliders or live data streams). It would improve the UX by removing flicker.

Use case would be linking widgets with `self.state.param.busy`, but at the current moment it could cause flickering:
https://github.com/holoviz/lumen/pull/783#discussion_r1868152821

I think it would be implemented here https://github.com/holoviz/param/blob/main/param/parameterized.py#L2297-L2357