Chore: use item imports in bench-vortex

[connortsui20]

I'm guessing we didnt do this before because of the lance feature flags, I just added #[rustfmt::skip] in those cases

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.43%. Comparing base (cd80330) to head (13f6ac4).
⚠️ Report is 2 commits behind head on develop.

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