Resizable table rows

**Is your feature request related to a problem? Please describe.**
I've been using tables for constructing layouts more than anything else - having a resizable side panel in form of a table column is great. However, table rows don't seem to be resizable.

**Describe the solution you'd like**
It would be great to be able to set table rows to be resizable - mostly for the purpose of having a resizable bottom panel in my window.

**Describe alternatives you've considered**
Currently hacked something up with a long, thin button on the top of the lower table column which reacts to drag by adjusting the column heights. Not nearly as smooth as a table resize, and I can't figure out how to change the mouse button to indicate that it's drag-able.