Enhance error message according to feedback in Youtube channel

Is your feature request related to a problem? Please describe. Thanks for the great tutorial in Youtube: https://www.youtube.com/watch?v=M3ZWfamWrBM. The author shared several ideas “need to improve” in MONAI:

1. When the file path is wrong, MONAI doesn’t say where it is wrong.
2. When the key is missing, MONAI doesn’t say which transform is missing the key.
3. Need to highlight ITKReader can support DICOM and DICOM series, otherwise, users think we only support NIfTI files.
4. When some error happens in transforms, it prints all the data in the meta, it’s a mess especially in multiple workers.

[Nic-Ma]

For issue 2, enhanced the error message in PR: https://github.com/Project-MONAI/MONAI/pull/3759:

KeyError: 'Key `TEST` of transform `ScaleIntensityd` was missing in the data and allow_missing_keys==False.'

Thanks.

[wyli]

for item 4 I guess it’s the multiprocessing that makes the duplicated error messages and it’s not very informative when the messages are printed without ordering, some samples of logs:

• https://github.com/Project-MONAI/MONAI/issues/3604#issue-1096436278
• https://github.com/Project-MONAI/MONAI/issues/2885#issue-987501953
• https://github.com/Project-MONAI/MONAI/issues/2073#issuecomment-825650415

I feel we should remove the extra data logging unless we have a better way to do it (dump to temp file for each process separately?)