Add heuristic one-way measurement for NumericalInitializer#38
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When an estimated_total is provided, NumericalInitializer now produces a LinearMeasurement with uniform counts and stddev = 1/sqrt(rho), based on empirical analysis of DPQuantiles noise. DataGenerationV3 orchestrates this by initializing closed-domain columns first to estimate the total count, falling back to a new DPGaussianCount primitive when no closed-domain columns exist. Also inlines _gaussian_histogram and select_partitions_gaussian_thresholding into their respective DPMechanism classes to reduce indirection. PiperOrigin-RevId: 934559141
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Add heuristic one-way measurement for NumericalInitializer
When an estimated_total is provided, NumericalInitializer now produces
a LinearMeasurement with uniform counts and stddev = 1/sqrt(rho), based
on empirical analysis of DPQuantiles noise.
DataGenerationV3 orchestrates this by initializing closed-domain columns
first to estimate the total count, falling back to a new DPGaussianCount
primitive when no closed-domain columns exist.
Also inlines _gaussian_histogram and select_partitions_gaussian_thresholding
into their respective DPMechanism classes to reduce indirection.