Horizontal scrollbar for text inputs

### Is your feature request related to a problem? Please describe.
I am working on a text editor and the text regularly goes outside the width of the input field. I can scroll through the input field by using the arrow keys but my instinctual reaction is to try and scroll with shift+scroll wheel or the trackpad.

### Describe the solution you'd like
A `horizontal_scrollbar` configuration for text inputs. If True, the input will get a scroll bar like the ones for windows when the width of the text content exceeds the width of the input item.

### Additional context
I really appreciate the effort that has gone into this library. It's really the best GUI lib available for Python. I've tried so many other solutions and this one wipes the floor with them.