Add column without changing column width of existing column

[johjeub]

Is your feature request related to a problem? Please describe.
When I add a column to an existing table, typically all other columns decrease in witdth so that the overall table width stays the same. However, most of the time I want to keep most column widths the same and would only like to adjust one column.

Describe the solution you'd like
A function in the table that adds a column to the right without changing the width of the existing columns. Similar to the standard add row functionality for tables.

P.S.: I love this toolbar! Thanks for the awesome work :)