Re-ordering bitstreams on the item edit page not possible when pagination is triggered

[jonas-atmire]

Describe the bug
On the item edit page, all bundles are shown with their related bitstreams.
If more than 10 bitstreams are attached to a given bundle, those bitstreams are paginated.
That in and of itself is a good thing, but it has a negative effect on the possibility to reorder these bitstreams.
It's only possible to reorder bitstreams on the page that they currently are on

To Reproduce

• Take any random item and add more than 10 different bitstreams to a given bundle.
• Test that the reordering works on any given page by dragging and dropping
• 
• If you want to move a bitstreams from the second page to the first page, you'll notice that is not possible, you can only drag and drop on the same page

Expected behavior
With or without pagination triggered for bitstreams in a certain bundle, it should be possible to reorder the relevant files.

Simply increasing the number of bitstreams being shown before pagination is triggered is not an option, as some dataset repositories could have an even larger number of bitstreams.

[MW3000]

What could a possible UX look like? These ideas come to mind:

• Replace pagination with a "Show more" button, so that we get not separate pages, but extend the one list step by step
• Add a "Show on one page" button, that turns off pagination and shows all bitstreams in one list
• Add a "Change position" button for each bitstream, that opens a context menu that let's the user set the position in the list by entering a number

[tdonohue]

@MW3000 : In my opinion, there two "easiest" solutions might be:

• The "show more" option you mention which just extends the list.
• OR, a way to control the number of bitstreams per page in the pagination. If the Pagination had a control (like it does in Browse by pages) where you can change the number of bitstreams per page to 5,10,20,40,100... then that may be "good enough". You could just change the page size to move things across the current page boundary.