v0.8.4: ANN training and querying performance improvements

What's Changed

• chore: improve kmean training performance on CUDA by @eddyxu in #1368
• chore: improve kmean performance on MPS by @eddyxu in #1370
• chore: use torch.index_add to compute new centroids, to improve training performance on MPS by @eddyxu in #1371
• feat: schema::field_by_id() by @eddyxu in #1375
• feat(python): design an image extension type by @rok in #1272
• perf: improve KNN and ANN performance by @wjones127 in #1367
• feat: collect int/float/boolean/date page-level statistics on write by @rok in #1346
• chore: part 1/N of refactoring vector index into separate crate by @eddyxu in #1388
• fix: handle larger arrays in take by @wjones127 in #1383
• chore: cleanup tests to avoid errors when optional components are not present by @westonpace in #1374

Full Changelog: v0.8.3...v0.8.4