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

[dimitropoulos]

This discussion began on #4520, 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 would be usable, but that would be ideal if it was more globally accessible that way.

[dimitropoulos]

For anyone interested, we discussed this today on the stream: https://youtu.be/5oY1Et7RR1g?t=3662

I certainly agree that if this is something super common in MacOS that we should consider trying to support it, however the main issue is that our keyboard system is not context aware. On the stream we looked at the approach vscode uses (https://youtu.be/5oY1Et7RR1g?t=4843) where they give some context to the shortcuts to make sure that the same shortcut can be used for different parts of the application for different reasons. For this to work in insomnia, we'd need to do something similar.

[dimitropoulos]

By the way, if we do end up with an API for keyboard context, I'd suggest a list of conditions with an object for each key such that if any of the conditions pass, the keystroke is executed. For example, instead of

{
  "shortcut": "ctrl+p",
  "conditions": "inWorkspace || !modalOpen"
}

I would suggest something like

{
  "shortcut": "ctrl+p",
  "conditions": [
    { "inWorkspace": true },
    { "modalOpen": false },
  ]
}