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Add convenience function to `Operator` to apply it to random samples

Lukas Platz requested to merge operator_random_sample_convenience_function into NIFTy_8

When developing generative models, one often needs to pass random samples through operator chains to evaluate their output.

To eliminate the need to type op(ift.from_random(op.domain)) all the time, this MR adds the method get_random_sample() to ift.operators.operator.Operator. It implements the above given code without introducing import loops and passes keyword arguments through to the from_random call to make it as general as the reference code.

@parras @mtr What do you think about it? Do you have objections, also to the naming of the function? Is this functionality already present somehow?


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