[Feature]: Keyboard shortcuts to navigate and use the app

[FreddyFunk]

Pre-submission Checklist

• I have searched existing issues to make sure this feature hasn't been requested

Problem Statement

A user might want to use and navigate the entire app without a mouse and use keyboard input as the only input interface.

Proposed Solution

Provide full user remappable keyboard shortcuts for everything.

Alternatives Considered

No response

Additional Context

No response

[FreddyFunk]

@Thyname had some initial thoughts here:
#261 (comment)

[jotuel]

So there is this: pop-os/xdg-desktop-portal-cosmic#4

It gives insight into how COSMIC system apps handle things and about the protocol that some other desktops use. It looks like COSMIC is going for wayland protocol. For the time being this https://docs.rs/keybinds/latest/keybinds/iced/index.html crate and hardcoding seems best approach. Like those Snapshot ones for example. Maybe with HashMap of MenuAction to Message you could make them user configurable.

e. Crate I mentioned is for older Iced than new libcosmic. KeyBind & MenuAction from libcosmic is the only possibility.