🌮 Feature: Draggable Individual List Items 🌮

## Description
Hello, everyone.
In the [Lexical Playground](https://playground.lexical.dev/), the draggable block feature is great for restructuring items, but the one thing that I think could be improved in it is extending that functionality to dragging list items (`

`) on there own, instead of dragging the entire list.

In the image below, you can only drag the whole list which could be an unordered or ordered list in the DOM.


I propose that we implement a feature allowing the dragging of individual list items, like in Notion, PlateJS and many other text editors.


## Impact
This small optimization would enable better restructuring and a better dragging experience for all users. I'm more than happy to contribute, should this be accepted. Thank you.