Ability to set minimum size for the connected components in isolate()

[iyerkrithika21]

If the segmentation is too noisy the the isolate function fails as it is unable to handle the large number of connected components. ITK filter by default labels each non-zero unconnected pixel as a separate object, which is not efficient. We need to be able to specify the minimum object size required.

   # source: https://github.com/Bonelab/DECT_BoneAnalysis/blob/87ab9cad4afcc029085dc403ed212a7be39176ce/Segment_Edema.py#L110

   #Component labeling to remove small clusters less than 100 voxels in size:
    cc_filter = sitk.ConnectedComponentImageFilter()
    cl = cc_filter.Execute(edema_masked)

    cc_relabel = sitk.RelabelComponentImageFilter()
    cc_relabel.SetMinimumObjectSize(100)