Add render options for ListItemAttachments. Closes #249

[Ateina]

Q	A
Bug fix?	[ ]
New feature?	[ x ]
New sample?	[ ]
Related issues?	fixes #249

This PR adds a new displayMode property to the ListItemAttachments control, allowing users to customize how attachments are rendered. Users can now choose between three display modes:

• Tiles (default) - Displays attachments as tiles/thumbnails using DocumentCard components
• DetailsList - Displays attachments in a list format with file type icons, file names, and delete actions
• DetailsListCompact - Displays attachments in a compact list format with reduced row height and padding

Exa,ples:

[joaojmendes]

@Ateina Thank you for the improvement!