v0.1.9 easier model inference and dataset improvements

Model registry can load models directly using a weights file now.
Fixed bug in handling Parquet conversions in nested array of structs.
Add method to retrieve number of rows in a rikai dataset

What's Changed

• withOrigin work around for DBR 10.4 LTS by @da-tubi in #637
• Use user-space pytest to avoid installing pytest again by @da-tubi in #641
• Filesystem registry directly loads model weights by @eddyxu in #642
• Update docs for SQL ML and Model Type by @eddyxu in #644
• Pin antlr version by @eddyxu in #646
• Allow to customize collate_fn per model type by @eddyxu in #643
• Fix: set options for DummyModelSpec by @da-tubi in #647
• fix dataset conversion for nested structs by @changhiskhan in #651
• Get dataset size by @eddyxu in #652

Full Changelog: v0.1.8...v0.1.9