Support settings URLs for Wifi, VPN, HotSpot, Proxy #430

Problem

In the network indicator we have settings toggles and an expectation is being able to jump directly to their corresponding settings pages when middle clicking. However, we only support settings://network and no subpages

Proposal

Add support for:

• settings://network/wifi
• settings://network/vpn
• settings://network/hotspot
• settings://network/proxy

So that folks can middle click a settings toggle and jump straight to the relevant System Settings page

Prior Art (Optional)

Middle clicking toggles in Quick Settings jumps straight to relevant pages like Dark Mode and On Screen Keyboard