a factory for convolve scanners that carry along either the full history (more general / less efficient) or cumulative incidence (less general / more efficient). That is needed to implement susceptibility adjustments that depend on keeping track of cumulative incidence (e.g. the logistic_susceptibility_adjustment)
Mentioned as "out of scope" here: https://github.com/CDCgov/multisignal-epi-inference/pull/161