feat: add support for sending custom shortcuts (e.g., Ctrl+Alt+F1)

[Andrew15-5]

I confirm this feature has not been previously requested

• I have searched the issues and this feature has not previously been requested

Is your feature request related to a problem? Please describe.
I want to switch to a tty1 (and others) inside guest (Linux), but instead I can only switch to it in host (Linux).

Describe the solution you'd like
Probably something similar to https://askubuntu.com/q/54814. I don't really care.

Describe alternatives you've considered
I don't see any alternatives.

Additional context
None.