v0.8.2 Page-level stats and PQ bug fix

What's Changed

• chore: index / recall benchmark over dbpedia by @eddyxu in #1348
• feat: support storing page-level stats by @wjones127 in #1316
• fix: pq cosine fast lookup table by @eddyxu in #1354

Full Changelog: v0.8.1...v0.8.2