iOS: Sort bookmarks by date added

### Describe the feature you'd like to request

First of all, thank you very much for this great software.

I haven't found a way in the iOS app to sort my bookmarks in a folder by date added (only by title, link, and custom sorting). The date added is usually saved with the bookmarks. Is it also synchronized and could it be used for sorting? That would be very useful for my use case, as I have a lot of bookmarks in one folder and want to see which ones I added most recently.

### Describe the solution you'd like

Add option to sort by "date added" in iOS app.

### Describe alternatives you've considered

None

No file or test is named in the issue. Start by locating the iOS bookmark-folder sorting entry point and checking whether date-added data is synchronized; done means the iOS app offers a date-added sort option and orders bookmarks by that value.

Written by the indexing model from the issue text.