Add domain classes for study selected series and selection operator

[MMelQin]

Adding domain classes SeletedSeries and StudySelectedSeries, with the former encapsulate the selection name, DICOMSeries, and Image if applicable. The SelectedSeries are contained as a list in a DICOMStudy.
Adding simple selection rules in JSON, matching on DICOM Study and Series module attributes, limited to those exposed by DICOMStudy and DICOMSeries.
Adding selection logic in the DICOMSeriesSelection operator, as well as changing the output to list of StudySelectedSeries objects. It is extendable, and custom operators can be chained.
Update the DICOMSeriesToVolumeOperator to take in list of StudySelectedSeries object, and convert all series, though still limited to output the first series' image, as the inference operator can only support one input image.
Update operators' test methods.
Updated applicable example applications and Jupyter notebook to use the new API.
Updated domain classes to comply with DICOM Keywords for properties.
Updated DICOM loading operator to set domain objects' properties correctly.

Note: the style checker in the build/test fails because it complains about the camel case of the DICOM keyword properties of the DICOMStudy and DICOMSeries class, but it is best to use DICOM Standards based keywords names than the Python preferred naming convention (Pydicom also uses DICOM keywords as properties, so it is also consistent)

[gigony]

Great!
Looks good to me.
Please commit with a signature and fix style check failures.

[MMelQin]

@gigony thanks for your input. Will make changes soon and push.

[MMelQin]

I ran ./run check --autofix, python3 -m mypy --namespace-packages --explicit-package-bases . , and python3 -m flake8 . --count --statistics without any errors, before pushing the commit.

But getting the error in the build check
021-11-16 04:56:13 $ python3 -m flake8 /home/runner/work/monai-deploy-app-sdk/monai-deploy-app-sdk --count --statistics /home/runner/work/monai-deploy-app-sdk/monai-deploy-app-sdk/monai/deploy/operators/dicom_series_selector_operator.py:16:1: F401 'typing.Any' imported but unused 1 F401 'typing.Any' imported but unused

Oh well.