Update category.py to use action=move to move categories

Add functionality to apply the new, previously unavailable
"action=move" function to category pages with category.py.
Check if the bot account has the "category-movepages" right,
if not then default to previous functionality.

Bug: 65115
Change-Id: I1a21e18da4f15ac8ba4eb0967fdbb64eafe5a4e6