Expand MAISI to support a wider variety of synthetic data generation

[KumoLiu]

To enhance the versatility and adaptability of the MAISI framework, we propose expanding its capabilities to support more modality for synthetic data generation. For now, we only use CT, we can add MRI this will make the framework more useful for a variety of applications that require diverse data types and configurations.
Connective tissues sometimes lack contrast in traditional imaging modalities like CT, so combining data from multiple imaging techniques (e.g., MRI or PET-CT) could enhance differentiation