add both vertical and horizontal scroll in ctk_scrollable_frame.py

[esaenzzu]

user now can select if the frame should have both vertical and horizontal scrolls when creating a ctk_scrollable_frame

[Akascape]

@esaenzzu
I made this new CTkXYFrame widget which have both horizontal and vertical scrollbars in the same frame.

[esaenzzu]

hi @Akascape are there any plans to add this to the main customTkinter package?

[FedericoSpada]

Hi,
the same change has been proposed in #2361. I like that solution more because it avoids some code duplication.
Moreover, here, configure() and cget() methods don't work anymore since "_scrollbar" attribute doesn't exist when orientation == "both".