fix(core): Expose ClipboardManager and GlobalShortcutManager

[lemarier]

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[lemarier]

@chippers @lucasfernog not sure if its the best thing to do here, but with the PR #2262 we got access to the apphandler, and then we can get the global_shortcut_manager but if we don't import GlobalShortcutManager we don't have access to the impl, and is not exported right now.