Add explicit output key mapping for batch transforms

[bobokvsky]

Summary

This PR extends transform key mapping to outputs and fixes cleanup behavior for aliased keys.

• Add OutputSpec / ComputeOutput.keys so transform keys can be explicitly mapped to output table primary keys.
• Make BatchTransformStep use explicit ComputeInput and ComputeOutput specs instead of accepting raw DataTable objects in compute-level APIs.
• Fix incomplete transform keys generated by SQL metadata aggregation and output cleanup when output PK names differ from transform key names.
• Add regression coverage for aliased input/output keys, composite aliases, duplicated physical id columns, multiple outputs, updates, and deletes.
• Fix macOS local path expectations in filedir tests and update tqdm-loggable to remove Python 3.12 deprecation warnings.