gdksurface-win32.c: Add function to handle queued moves/resizes

gdksurface-win32.c: Add function to handle queued moves/resizes

Since we need to deal with queued moves and resizes in the Cairo, GL and Vulkan
draw contexts, and the logic involved in all three of these are largely
similar, add a function gdk_win32_surface_handle_queued_move_resize() that will
handle this, which will be shared between these three types of draw contexts.