Implement feature to move items between columns and between items

[ZanderCowboy]

https://api.flutter.dev/flutter/widgets/Draggable-class.html

Update:
Draggable has been tested and implemented, but for our purpose, it is limited. ReorderableListView has been implemented for the tabs but it still needs to be implemented for the entries. Also, Draggable can be removed from the code.

[ZanderCowboy]

Update:

Adding a few tabs:

And adding a few entries:

Rearranging tab 2 and tab 4 we get:

Video:
https://github.com/ZanderCowboy/multichoice/assets/59666243/28d1d113-f7d9-4986-b1db-ad673ea2b275