Is your feature request related to a problem? Please describe.
this feature request is for adding basic Dicom support with a pydicom backend in addition to the existing readers (by extending the base class monai.data.ImageReader)

note that as references:

• there are deploy operators based on pydicom such as https://github.com/Project-MONAI/monai-deploy-app-sdk/tree/main/monai/deploy/operators
• the current itk backend ignores the some of the tags, but in general the new backend implementation should return a similar data structure: https://colab.research.google.com/drive/14R9RzmaKQn0Ahpxf9OwhW6U7kcH1_MRi
• the new backend will support the reading MONAI Datasets for TCIA #4227