Split and paginate file tree from the diffs metadata

As well as paginating merge request file batches we could also paginate our metadata. This is important because a large MR can not only consist of large files but also of lots of files changed (hundreds and thousands). Having a pagination there should increase the perceived performance of the MR.

Questions:

• Is it possible?
• Would it be considerably faster than fetching the whole metadata at once?
• Downsides?