Add direct access #369

Job	Run time
test_base_models	30s
copyright (3.9)	3s
test_battery	29s
test_calc_error	52s
test_centrifugal_pump	46s
test_composite	22s
test_data_model	1m 54s
test_datasets	34s
test_dict_like_matrix_wrapper	32s
test_direct	31s
test_ensemble	28s
test_estimate_params	39s
test_horizon	40s
test_linear_model	36s
test_loading	24s
test_moe	28s
test_pneumatic_valve	1m 40s
test_powertrain	47s
test_predictors	1m 46s
test_serialization	40s
test_sim_result	24s
test_state_estimators	34s
test_surrogates	2m 11s
test_uav_model	37s
test_uncertain_data	24s
	18m 51s

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