how to set colspan from createColumnHelper.
Just started with tanstack table, so far I'm really liking it. But I want to set a colspan of 4 or 5 on the first column of my table. I'm not able to find out how to do this just yet, so wanted to ask. I've tried using "size" in the column, but it doesn't seem to affect colspan, and typescript complains if I try to pass in an arg of colspan