Add a way to choose theme variant (Gnome dark/light theme)

[jeremy447]

Hello,

The default Gnome theme Adwaita come with 2 variants. One light and one dark. Each app that implement the feature, like Gnome terminal, allow you to choose the theme variant in the preference. It will be awesome if we can do this in Vs Code.

Thanks !

[jeremy447]

Shouldn't be hard to implement this since electron support this feature
electron/electron@058d0bb

[jeremy447]

Like Gnome Terminal, the default theme should be the dark one.

[vscodebot]

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