add displayText for shortcut items #9738

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Problem

keyboard shortcuts are not displayed on the screen in core, but may be displayed in some cases such as in help menus. having text associated with the shortcut would make it easier for developers to implement their own help menus.

Request

add an optional displayText property to KeyboardShortcut interface. it should be allowed to be a string or a function that returns a string.

being optional means this is not a breaking change

then update all existing keyboard shortcuts in core to provide text for all built-in shortcuts. the ones in core should be a function that returns a Blockly.Msg for the shortcut as it will be displayed in menus

Alternatives considered

No response

Additional context

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