Add a new right-aligned "description" property to TreeItems

Similar to the timestamp in the Timeline view, it would be nice to have the ability to have a string that would be rendered right-aligned for each tree item.

Maybe something like:

export class TreeItem {
    label?: string;
    description?: string | boolean;
    ...
    endDescription?: string; // or endDetails? or even just details, but that feels wrong given the other usages of details
}

[alexr00]

Current:

Example where we hide the right-aligned description on hover when the action is shown:

Example in the panel:

[alexr00]

No plans for this as yet. If folks who would use this could provide some details about what problem it would solve for them it would help us to prioritize this though.