RNN integration to GL

[chyalexcheng]

The RNN module is made for the triaxial dataset. It should be generalized to

• take DynamicSystem.ctrl_data (input), DynamicSystem.param_data (input), andDynamicSystem.sim_data (output) coming out of GL directly
• Make predictions using only input and param data #69
• Automatically run a hyperparameter tuning #71
• Allow a mixed use of machine learning and model-based