make the PrKalmanFilter a multi transformer

Michel De Cianrequested to merge
decianm-PrKalmanFilterMultiTransformer into master

Needed in order to have access to all elements of the output, if it is combined e.g. with the PartialChiSquared.

Needs Moore!1666 (merged) and Alignment!302 (merged)

@ausachov @gunther @chasse

Edited by Andrii Usachov

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