Preferences Dialog: Implement telemetry controls (checkbox)

[afiune]

Description

Placeholder to enable the telemetry controls inside the Preferences Dialog.

The checkbox is currently commented out. We need to work with UX and Legal
on the phrasing and disclosure.

[tyler-ball]

Note: the app writes UI-customized config to a .app-managed-config file and our Ruby ecosystem does not know about that file. We will need to decide how to have all our applications read (and possibly write) all the same configuration.

One idea @afiune had was to write a Golang library to read/write all our config, expose a Golang binary that can do the same thing, and then have Ruby call this executable.