ENH: Add Transform `TransformedPointSameAsITKBSpline` GTest unit tests
ENH: Add Transform `TransformedPointSameAsITKBSpline` GTest unit tests

Extended input test values for `Expect_elx_TransformPoint_yields_same_point_as_ITK`, also improving the unit test of other transforms.

SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix