build: Implement Display trait for Cfg

[xtqqczze]

cc: @tgross35

[xtqqczze]

There would be an easy way to implement this using strum crate, if we can take build dependencies?

#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, strum::Display)]
#[strum(serialize_all = "snake_case")]
enum Cfg {
    ...
}

[tgross35]

There would be an easy way to implement this using strum crate, if we can take build dependencies?

No please, not worth it for ~20 lines of code

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[tgross35]

Thanks!

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