Allow TreeItems have bold, underline or italics style

[sfilata]

Hi, I used the TreeItems to show a Treeview to show the resource in my project. I found there is only the highlight style in the TreeItemLabel, it will be very nice to add more style like the bold, underline or italics.

/**
 * Label describing the {@link TreeItem Tree item}
 */
export interface TreeItemLabel {

    /**
     * A human-readable string describing the {@link TreeItem Tree item}.
     */
    label: string;

    /**
     * Ranges in the label to highlight. A range is defined as a tuple of two number where the
     * first is the inclusive start index and the second the exclusive end index
     */
    highlights?: [number, number][];

    /**
     * Ranges in the label to the specfic style. A range is defined as a tuple of two number where the
     * first is the inclusive start index and the second the exclusive end index
     */
    bold?: [number, number][];
    underline?: [number, number][];
    italics?: [number, number][];
}

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Happy Coding!