Keyboard input when qemu window is grabbed should be input to UART0 (QEMU-262)

[0xPIT]

Checklist

• Checked the issue tracker for similar issues to ensure this is not a duplicate.
• Described the feature in detail and justified the reason for the request.
• Provided specific use cases and examples.

Feature description

It would be helpful if esp-qemu would, while the qemu window is grabbed, send all keystrokes as scan codes as an input to the UART # specified in a command line argument, so that it could be read using uart_read_bytes().

Use cases

I'm currently developing an emulator and I use qemu with esp_lcd_qemu_rgb to simulate a LCD.

It would be helpful for experimenting and debugging, if I could capture keyboard input directly from the qemu window.

Alternatives

No response

Additional context

No response