Can I create submenus for System Tray Menu Actions?

[rsshilli]

Hello,

First, thank you for creating this package! It's really nice.

I'd like to create a submenu for one of my action items in my system tray. For example, I have something like:

 <SystemTrayIcon icon={icon} visible>
 <Menu>
 <Action text="Do something"/>
 </Menu>
 </SystemTrayIcon>

And I'd like to make a submenu for my action. So something like:

 <SystemTrayIcon icon={icon} visible>
 <Menu>
 <Action text="Do something">
 <Menu>
 <Action text="Show"/>
 <Action text="Hide"/>
 </Menu>
 </Action>
 </Menu>
 </SystemTrayIcon>

Very similar to what's being shown off here: https://github.com/nodegui/examples/blob/master/nodegui/systray/src/index.ts#L35-L55

Is this possible today? If not, could you please add it, or give me some direction on where to add it?

Ryan