FEAT: accept array-valued parameters in estimators - #583
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Parameter values passed to ChiSquared and UnbinnedNLL may now be one-dimensional arrays of shape (p,), which are broadcast against the event axis so that the estimator returns one value per parameter point, all in a single backend-parallelized call. This makes it cheap to e.g. propagate fit uncertainties over bootstrapped parameter samples, as done in ComPWA/polarimetry. Behavior for scalar parameter values is unchanged. Closes #571
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Closes #571