Implement `web` for Keyboard

## Feature Request

### Plugin
Keyboard

### Description

There are indirect ways of detecting a virtual keyboard being open on the web -
https://github.com/semmel/on-screen-keyboard-detector

I would like there to be a web implementation for the keyboard plugin, to detect when the keyboard is open or not.

### Platform(s)
web

### Preferred Solution
Use `on-screen-keyboard-detector` directly

### Alternatives
Reimplement `on-screen-keyboard-detector`