nixcache: automatically configure nix daemon

[gcurtis]

Before installing packages, check to see if the Nix daemon is already configured to use a Devbox cache when one is available. The user no longer needs to explicitly call devbox cache configure, however the command is still there (and hidden) to make sudo escalation possible.

There are a few known limitations in this initial implementation:

• We don't keep track of "no" responses to sudo, so Devbox will bug the user every time if they refuse.
• The Nix daemon needs to restart after adding a trusted user. We currently only support auto-restarting the daemon on macOS and assume its managed with launchd.
• We sleep rather than poll for the daemon to restart. This only happens when a trusted user is added, but it does make things a little flakier.

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ *exec.ExitError: <redacted usererr.combined>: nix build exit code: 1, output: <redacted []uint8>, err: <redacted ...** go.jetpack.io/devbox/internal/nix in Build View Issue

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