Add AutoGuide.predict*() methods #2851
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Addresses #2848
This adds four new methods that intend to replace
Predictive(...)for autoguides:.predict()draws a single sample.predict_sample()draws a batch of samples.predict_median()traces the model with median latents.predict_quantile()traces the model with quantile latentsThese methods differ from
.__call__(),.median()and.quantiles()in that they additionally replay and trace the model against latent values, thereby giving access to deterministic nodes (which e.g. is important for reparametrization).Tested