Add plot method for default_priors

[GidonFrischkorn]

When I was thinking about the default_priors for the m3, I thought having an easy way of plotting the default_priors on the parameters and native scale would be nice. I was thinking about something similar to the plots you generated for the "extract info" vignette. What do you think about this?

[venpopov]

You read my mind. I was thinking about the same thing earlier this week. In prncile you can do this by running the model with "sample_prior = only" but that requires compiling the model, extracting the draws, transforming them, etc. So it would be great I you want to make such a function

[venpopov]

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