Allow use of ctrl+p/ctrl+n to navigate request switcher

This discussion began on by @akivajgordon, which originally stated > On macOS, native lists or multi-line text fields, as well as the command line allow for using ctrl+p or ctrl+n to navigate up and down respectively. > This is a learned habit from the equivalent emacs keys, and for people that know about it and use it, it's the preferred way of navigating lists so that we don't have to move our hands from the main keyboard area. > Note: I have tested this only on macOS and I am aware that Windows/Linux have different semantics such that this might not fit. Perhaps this key combination needs to be specifically limited to macOS, which I haven't researched what the appropriate way to do that for this project would be. If there is already semantics for that, feel free to point me in that direction and I can give that a shot. > I'm not familiar with other areas of the app to know if there are other lists in which this kind of functionality woul…