Support `virtual-keyboard-unstable-v1` Wayland protocol

Support virtual-keyboard-unstable-v1 Wayland protocol

I want something like xdotool in x11 for wayland, and I found wtype. But it relies on the virtual-keyboard-unstable-v1 Wayland protocol and mutter doesn't support this protocol yet. Then could we support this?

How would you like it to work

mutter supports virtual-keyboard-unstable-v1 Wayland protocol.

Relevant links, screenshots, screencasts etc.

The wtype's issue about this.

wlroots supports this protocol. Maybe we could refer their code.