Allow silencing variational inference log messages

[solna86]

Is it possible to disable variational inference log messages like:

┌ Info: [ADVI] Should only be seen once: optimizer created for θ                                                                                                              
└   objectid(θ) = 0x7e588a956c33cb39

setprogress!(false) does not make a difference, and I could not find an alternative method in the documentation.

[devmotion]

IIRC these messages are generated by AdvancedVI. https://github.com/TuringLang/Turing.jl/issues/1398#issuecomment-687259280 contains two examples for how to suppress them.

[Red-Portal]

I'll close this since this seems to have been resolved.