v0.8.15 scalar index, f16 vector index, and various fixes

What's Changed

• chore: fix type inference errors in benchmarks by @westonpace in #1556
• chore: provide a trait to dynamically dispatch different pq based on different vector data type by @eddyxu in #1555
• chore: update the CI build to check/build all crates in the workspace and not just the lance crate by @westonpace in #1557
• feat: make it possible to create and load scalar indices for a dataset by @westonpace in #1516
• feat: generic Product Quantizatoin by @eddyxu in #1560
• test: add property-based testing for statistics by @wjones127 in #1554
• feat: ffi to accelerate norm_l2 for f16 if the instruction set is available by @eddyxu in #1562
• feat: extend FSL with sample by @eddyxu in #1572
• feat: allow for more advanced storage options in objectstore by @universalmind303 in #1547
• feat: implement as_slice for bfloat16 array by @eddyxu in #1574
• perf: add bf16 benchmarks by @eddyxu in #1575
• feat: f16 for L2 by @eddyxu in #1577
• chore: update cc dependency to 1.0.83 by @westonpace in #1578
• feat: make IVF model support f16 and bf16 by @eddyxu in #1573
• feat: allow the scanner to take advantage of scalar indices by @westonpace in #1543
• chore: dotprod should be on mac target, not haswell and better randomness for bf16 by @westonpace in #1579
• feat: make Dataset::nearest() accepts arbitrary query type by @eddyxu in #1582
• chore(rust): remove extraneous dbg message by @changhiskhan in #1598
• feat: torch cache-able dataset, with sampling support by @eddyxu in #1591
• fix: tell writer correct schema when writing index file by @wjones127 in #1518
• feat: add support for remapping scalar indices during compaction by @westonpace in #1571
• refactor: switch to using DataFusions physical expr by @wjones127 in #1581
• chore: various fixes for Python benchmarks by @wjones127 in #1513
• feat: adaptive cuda allocation for l2/cosine distance computation by @eddyxu in #1601
• fix: fix a memory leak where a dataset would not be fully deleted by @westonpace in #1606
• fix: google objectstore uses proper gs configuration by @universalmind303 in #1608

Full Changelog: v0.8.14...v0.8.15