WIP: Convert lending club to vertex AI

[dvdjlaw]

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[dvdjlaw]

Notes:

Vertex doesn't seem to be fully ready yet.

• the gcloud api doesn't seem to be feature-complete
• gcloud beta ai custom-jobs allows using pre-built containers, but doesn't support hyperparameter tuning
• gcloud beta ai hp-tuning-jobs allows hyperparameter tuning, but there's no link to HyperparameterTuningSpec documentation and it requires most config to be passed via yaml.
• Using the container built via custom-jobs for hp-tuning-jobs seems to use Python 2.7 for the entrypoint ...
• Fully writing the container (Dockerfile) would likely get around this issue but is a larger change and not exactly in line with the original approach of this example