Add keyboard shortcuts for navigating lists (issues, files, MRs, etc.)

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Description

Currently it is not possible to navigate lists (e.g. files list or issues list) with keyboard.

Proposal

1. Identify situations where lists could be navigated by keyboard (e.g. files list, issues list, MR list etc.). This can of course be done incrementally, though the initial design robustness might benefit from considering more than one situation.
2. Add keyboard shortcuts "j" and "k" for moving selection down and up the list, respectively
3. Add keyboard shortcuts "o" or "enter" to open the selected item

Note: in file browser, going a level up is achieved by selecting the ".." item and opening it.

This is how it behaves on GitHub. Also it behaves this way on GMail (list of emails) and Google Groups (list of topits).

Links / references

~"feature proposal"