[Feature request] Have an option to use gerrit style file sort.

[eternity74]

Hi, Thanks for providing great plugin for daily use.

I sometimes compare local commit with gerrit changes by using diffview.nvim plugin.
For this use-case, there is mismatch on file sort compare to gerrit.
Gerrit seems to give higher priority to cppheader files so header file comes first and source file laster.
(see https://github.com/GerritCodeReview/gerrit/blob/master/java/com/google/gerrit/common/data/FilenameComparator.java#L60)

I want to have the same behavior with option like gerrit_style_filesort = true.