Upgraded packaging system & consolidated CLI interface

Provides consolidated CLI interface for training and predicting stages.
PEP621 compliant packaging syste using pyproject.toml for isntallation and consistent dependency management

pre-refactor release candidate

Original train/predict as separated standalone units. Release previous to upstream merge from forked refactored branch.
CLI based API changes breaks backwards compatibility - use this version for pre 2023-04 deployments