[TreeView] Create an "Item customization" doc page that uses useTreeItem2 and TreeItem2

[flaviendelangle]

The TreeItem2 component and useTreeItem2 hooks have been released during the v7 beta and will replace the TreeItem component in the next major (v8).

We lack a proper documentation about these new elements.
The scope of this issue is:

1. Present each slot (2 example per slot on for slots and one for slotProps, similar to this page)
2. Present useTreeItem2 and how to use it to replace a ContentComponent prop on TreeItem
3. Present how to disable some default behaviors using .defaultMuiPrevented
4. Link this new page in "Simple Tree View => Customization" and "Rich Tree View => Customization"
5. Show how to access the item object inside the Tree Item component (see [TreeView] Tree Item do not receive the item defined in RichTreeViewProps['item'] #12697)

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