Scalar and Batch Unity Catalog Python UDFs

Python functions registered and governed in Unity Catalog, as row-at-a-time scalar UDFs or batch UDFs, that run on all supported compute types. They can install custom dependencies and use Unity Catalog service credentials and secrets, and the earlier limit of five UDF calls per query no longer applies.

Status and dates are extracted from public sources only. We don't see the private AE-shared roadmap. If something looks wrong, tell us.