keyboard_map library Null safety

Keyboard Map

https://wicg.github.io/keyboard-map/

Classes

KeyboardLayoutMap
Experimental: This is an experimental technologyCheck the Browser compatibility table carefully before using this in production. The interface of the Keyboard API is a map-like object with functions for retrieving the string associated with specific physical keys. A list of valid keys is found in the UI Events KeyboardEvent code Values specification.