devices: externalize nvidia device driver

[tgross]

Fixes #8330 (and gets us closer to #5643)

This PR externalizes the Nvidia device driver (it's been copied to its own repository at https://github.com/hashicorp/nomad-device-nvidia).

[tgross]

Depending on how folks feel about breaking existing users of the Nvidia driver, we may want to hold off landing this until we're ready to ship Nomad 1.2.0.

[the-maldridge]

This feels like a 1.2.0 type change. Almost all other large changes like this have been in the bigger bumps, so intuitively it feels like this should be too.

I'd also say that libcontainer is much more portable than the nvidia drivers and supports static linking.

[schmichael]

LGTM and +1 on 1.2.0 as @tgross and @the-maldridge have discussed. Luckily it's a pretty tidy PR so hopefully letting it hang out won't cause much merge pain.

[github-actions]

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