v0.8.1 Index training speed up. Usability improvements

What's Changed

• feat: add a cache for dynamodb schema validation by @chebbyChefNEQ in #1308
• chore: speed up kmean training for cosine by @eddyxu in #1334
• feat: add take() method to RecordBatchExt by @eddyxu in #1337
• feat(python): expose row id in python API by @eddyxu in #1339
• feat: data generation of dbpedia dataset by @eddyxu in #1340
• feat: build ivf partition using disk based shuffler by @eddyxu in #1312
• feat: friendlier error messages in nearest api by @rok in #1336

Full Changelog: v0.8.0...v0.8.1