Custom Columns for Feature Table Data Retrieval via TAF API

NetBrain currently requires users of the TAF-lite API to retrieve Feature Table data through one call and then make a separate call per Network Intent to obtain execution results, which does not scale for environments with large device counts and multiple rules per device. This enhancement would allow custom columns, such as Intent Status Code and execution timestamp, to be included directly in the Feature Table so that all relevant data can be retrieved in a single API call. Reducing the number of required calls would improve scalability and efficiency for customers exporting automation results to external systems such as data lakes.