in-memory object readers/writers

[wyli]

A generic reader that converts external data representations into monai MetaTensor would make a few use cases easier:

• monai deploy SDK InMemImageReader
  https://github.com/Project-MONAI/monai-deploy-app-sdk/blob/42bec18db83853ee5f2d14f84de12322a908bbe0/monai/deploy/operators/monai_seg_inference_operator.py#L296-L300

• itk data object <> metatensor bridge
  Expose ITK Image to MONAI MetaTensor conversion #5897

• read/write from different types of sources

  • LoadImage and SaveImage using network source (S3 or Google Cloud Storage) #4135
  • How to open dicom with LoadImage() from Tempfile #1656

similarly, a metatensor to external object writer API will help export data representations for better interoperability such as

• [Feature request] Plugin/Module to visualize MONAI Transforms #5711