Custom Plugin-Defined Column Support in Interface Inventory Report

The built-in Interface Inventory Report currently supports only a fixed set of predefined columns and does not allow values derived from custom plugins to be displayed alongside standard interface attributes. This enhancement would allow users to add a custom column to the Interface Inventory Report that displays a value set through a plugin, enabling plugin-derived data to appear in the same table as native interface fields. Customers who rely on plugins to compute or assign custom attributes would benefit from a unified report view that consolidates both standard and customized data without needing separate tools or manual cross-referencing.