feat: Add letter-based jump bar

[FlamingPhoenix40]

Feature description

Currently, the only way to find the token you need, is to use the search bar, or to manually scroll to the right entry. One feature I had in my previous OTP app which I really liked, is a jump list on the right side of the screen. You can use it to quickly jump to the correct first letter of the token you’re searching for. If you need a more accessible example, Apple offers the same kind of jump list in the “Apps” section of the new iOS 18 settings app. I will add a screenshot as well. I mean the vertical list of letters on the right side of the screen.

Motivation

If the app was open before, and iOS has not closed it automatically, it will still be scrolled to the item you used before. This means that in order to get to the search bar, you have to scroll to the top first. You can also manually scroll to the item you need, but the jump list makes this way of scrolling faster and easier in my opinion.

Acknowledgements

• [X] This issue is not a duplicate of an existing feature request.
• [X] I have chosen an appropriate title.
• [X] All requested information has been provided properly.