CIL
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Add options for step-size rules and pre-conditioners to the GD algorithm
As required for the stochastic paper and discussed with @paskino, @epapoutsellis, @casperdcl and @KrisThielemans. Linked to https://github.com/TomographicImaging/CIL/issues/1588 and https://github.com/TomographicImaging/CIL/issues/1586