[Elastix Parameters --> ITK Transforms] Provide function to convert Elastix's TransformParameter.txt to ITK transforms

Context
- 3D Visualization software like [3D Slicer](https://www.slicer.org/) provide a larger number of visualization modules for different purposes.
- One of the modules, the [Transform](https://www.slicer.org/wiki/Documentation/4.10/Modules/Transforms) module allows loading of *.tfm* files. These files can be created by using for e.g. `sitk.WriteTransform(sitk.BSplineTransform(3), 'BSpline.tfm')`. This Transform module is quite handy as it allows for easy visualization of the deformed grids of BSpline.

Is there a roadmap to include these kind of `Elastix -> ITK Transform` helper functions in ITKElastix?
- Example 1: [Convert Affine + BSpline into a Composite Transform](https://gist.github.com/prerakmody/9bcd8b055ea3ea32b7cc0fc669e82900#file-convert_elastix_to_itk_transform-py)