Add HTJ2K DICOM support and upgrade to pydicom 3.0

Key Changes:
- Upgrade to pydicom 3.0.0 for HTJ2K support
- Replace pydicom-seg with highdicom (pydicom-seg unmaintained)
- Add NvDicomReader for GPU-accelerated DICOM decoding with nvidia-nvimgcodec

NvDicomReader Features:
- HTJ2K transfer syntax support (1.2.840.10008.1.2.4.201/202/203)
- Batch decoding optimization for HTJ2K series
- Proper spatial slice ordering and affine matrix calculation
- Configurable layouts (NumPy D,H,W or ITK W,H,D)
- Fallback to pydicom/SimpleITK when nvimgcodec unavailable

DICOM SEG Improvements:
- Migrate to highdicom for DICOM SEG creation
- Memory-efficient processing with stop_before_pixels
- Support up to 65,535 segments (uint16)
- Preserve ITK/dcmqi fallback path

Optional Dependencies:
- nvidia-nvimgcodec and dcmqi are now optional
- Runtime checks with clear installation instructions

Testing:
- Comprehensive NvDicomReader tests (HTJ2K decoding, consistency, metadata)
- DICOM ↔ NIfTI conversion tests for original and HTJ2K files
- Automatic HTJ2K test data generation

Signed-off-by: Joaquin Anton Guirao <janton@nvidia.com>

Author: jantonguirao

monailabel/config.py

@@ -18,7 +18,7 @@
 
 
 def is_package_installed(name):
-    return name in (x.metadata.get("Name") for x in distributions())
+    return name in (x.metadata.get("Name") for x in distributions() if x.metadata is not None)
 
 
 class Settings(BaseSettings):