[FEATURE] Add image loading to apply subtracting Hadamard matrix method

[acsenrafilho]

Is your feature request related to a problem? Please describe.
There is a loading image technique that uses Hadamard method that is computationally cheaper than acquiring all the data in ASL traditional method.
The asltk project can offer a method to load such data

Describe the solution you'd like
Add an input/ouput module to facilitate the usage of such data