feat(simulator): add image saving utilities for verification

mini-nav/utils/__init__.py

@@ -4,6 +4,7 @@ from .feature_extractor import (
     extract_single_image_feature,
     infer_vector_dim,
 )
+from .image import numpy_to_pil
 
 __all__ = [
     "get_device",
@@ -11,4 +12,5 @@ __all__ = [
     "infer_vector_dim",
     "extract_single_image_feature",
     "extract_batch_features",
+    "numpy_to_pil",
 ]