Feature Request

Being able to log progress without having a set number of iterations would be great. Currently AbstractMCMC is using ProgressLogging as a backend and they've just added convergence sampling.

This is currently implemented in ProgressMeters.jl. I really like how it spits out the total time information in addition to just updating current values vs. threshold.

Example Usage

Something like this:

cur = 0
goal = 10
@withprogresslogging while true
    @logprogress cur goal
    cur += rand()
    cur < goal || break
end