feat: Create Lambda to query Training job

[brightsparc]

Replace the evaluate.py processing job with a Lambda Step that returns the report dictionary Model Quality Metrics

    # Get the training job
    response = sm_client.describe_training_job(TrainingJobName=job_name)
    status = response["TrainingJobStatus"]
    logger.info("Training job:{} has status:{}.".format(job_name, status))

    # Get the metrics as a dictionary
    report_dict = {
        "regression_metrics": {   }
    }
    for metric in response["FinalMetricDataList"]:
        report_dict["regression_metrics"][metric["MetricName"]] = metric["Value"]