[Feature Request] Filter chapter list for duplicates

[xdeiimoss]

What feature should be added to Suwayomi?

add a filter to only show the duplicated chapters (on the entries), for a faster way to look for them without having the possibility to miss one or another in an entry that has a lot of chapters. this would be a way to easily filter out duplicated chapters, since both duplicated chapters would appear, and we would just have to choose between scanlators

Why/Project's Benefit/Existing Problem

this would be an feature that would help with #777