List Item: Add layout support

[SainathPoojary]

Part of: #43248

What?

Added Layout support to the List Item Block.

Why?

The block was missing Layout Support Features.

Testing Instructions

1. Test the List Item block in both the block editor and site editor.
2. Confirm that the layout setting work correctly, and display correctly on the front.

Screencast

Screen.Recording.2025-02-17.at.3.39.53.PM.mov

[github-actions]

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Co-authored-by: SainathPoojary <[email protected]>
Co-authored-by: carolinan <[email protected]>

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[carolinan]

I don't think layout support is suitable for this block.
I want to ask the same question as for the submenu, why does the block need layout support?

Why is there a wide content width option, when the block can not be wide?
For this block, I think the text alignment option (the justification) is confusing, because it makes it more difficult to identify which list items that are nested. Because the position of the item is how we usually determine if an item is nested, together with the bullet.
Overall I found it a confusing experience.