feat(refactor): refactor DepthEncoderConfig quantization pipeline, so that the methods do not live in the config class. Add pixel format - channels validation.Move the default pixel format for depth in the config file.

tests/datasets/test_dataset_metadata.py

@@ -53,6 +53,7 @@ IMAGE_FEATURES = {
     },
 }
 
+
 def _make_dummy_stats(features: dict) -> dict:
     """Create minimal episode stats matching the given features."""
     stats = {}