STYLE: Add typehints for the itkTypes
STYLE: Add typehints for the itkTypes

Types referenced from inside of class need to
be given as strings for python <3.10.

https://www.python.org/dev/peps/pep-0484/#id28

richardbeare/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,hjmjohnson/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,vfonov/ITK,LucasGandel/ITK,BRAINSia/ITK,thewtex/ITK,Kitware/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,LucasGandel/ITK,thewtex/ITK,thewtex/ITK,vfonov/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,hjmjohnson/ITK,richardbeare/ITK,Kitware/ITK,vfonov/ITK,LucasGandel/ITK,Kitware/ITK,vfonov/ITK,LucasGandel/ITK,thewtex/ITK,thewtex/ITK,Kitware/ITK,richardbeare/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,richardbeare/ITK,BRAINSia/ITK,thewtex/ITK,LucasGandel/ITK,LucasGandel/ITK,vfonov/ITK,richardbeare/ITK,hjmjohnson/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,hjmjohnson/ITK,vfonov/ITK,BRAINSia/ITK,BRAINSia/ITK,Kitware/ITK,richardbeare/ITK,BRAINSia/ITK,hjmjohnson/ITK,vfonov/ITK,BRAINSia/ITK