Add metaKey support for shortuts

[karolis-zukauskas]

Is your feature request related to a problem? Please describe.

Can't register a shortcut via UiFramework.keyboardShortcuts.loadShortcut(shortcut); that runs with metaKey modifier ("Win" key on Windows, "Cmd" key on Mac). For example, I would like to register a shortcut for Mac "Cmd+P".

See KeyboardShortcutProps:

appui/ui/appui-react/src/appui-react/keyboardshortcut/KeyboardShortcutProps.ts

Line 22 in b927754

export interface KeyboardShortcutProps extends CommonProps {

metaKey docs: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/metaKey

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