ENH: Add LabelGeometry oriented-image baselines for canonical eigen signs

Three CID blobs for the regenerated itkLabelGeometryImageFilter oriented
bounding-box baselines, needed by the ITK eispack->Eigen eigensystem migration.
The itk::SymmetricEigensystem replacement canonicalizes eigenvector signs
(largest-magnitude component positive) for cross-platform reproducibility,
which deterministically changes the sign-dependent oriented-image rendering.
All scalar measurements are unchanged.

  itkLabelGeometryImageFilterTest.png      bafkreihnydkahvqsph6ec43yifgbfra7swq2xglf5r5u3x6zku3oph72bi
  itkLabelGeometryImageFilterTest3D.mhd    bafkreicpmfdhcbamx7tw7ayuw7npbhscshw46ft7pmo2bn3kbgpoi4sp5e
  itkLabelGeometryImageFilterTest3D.raw    bafkreiab6owerbif2uvilywfpkzcqsfjnuzmaxb3q2eehzd4vphrjmnxmq

Author: hjmjohnson

CID/bafkreiab6owerbif2uvilywfpkzcqsfjnuzmaxb3q2eehzd4vphrjmnxmq

@@ -0,0 +1,13 @@
+ObjectType = Image
+NDims = 3
+BinaryData = True
+BinaryDataByteOrderMSB = False
+CompressedData = False
+TransformMatrix = 1 0 0 0 1 0 0 0 1
+Offset = -2.44885 17.2097 1
+CenterOfRotation = 0 0 0
+ElementSpacing = 2 2 2
+DimSize = 41 21 19
+AnatomicalOrientation = ???
+ElementType = MET_UCHAR
+ElementDataFile = itkLabelGeometryImageFilterTest3D.raw