Adds a VPN control widget for the control center and lock screen

[diegoreymendez]

Task/Issue URL: https://app.asana.com/0/1203108348835387/1208485618883319/f

Description

Adds a VPN control widget for the control center and lock screen.

Testing

1. Go to the control center dashboard
2. Add a widget
3. Search for "VPN", and you should see our widget to toggle the VPN on/off. Add it.
4. You can resize the widget in the dashboard before saving.
5. Turn the VPN on/off, make sure it works.
6. Go to the lock screen, press on the background for a few seconds.
7. Customize your lock screen.
8. Remove one of the two circle-widgets in the bottom of the lock screen, and add the VPN one.
9. Make sure it works well.

Definition of Done (Internal Only):

• Does this PR satisfy our Definition of Done?

Copy Testing:

• Use of correct apostrophes in new copy, ie ’ rather than '

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Internal references:

Software Engineering Expectations
Technical Design Template