Convert examples to using real objects so they can actually be run.

[gowerc]

Comment from @danielinteractive

try to avoid use of “dontrun” as in e.g. here - e.g. for shorter run time consider less iterations, or starting from intermediate objects to focus only on the function documented here
reason: you want to be confident that the examples really run without errors

Yeah you could export those. So my idea was:
draws -> example_draws
impute -> example_impute
analyse -> example_analyse
pool -> example_pool
and use these example_* objects in the examples.

[nociale]

@pengguanya If we go with the idea of exporting draws, impute, analyse, and pool objects, I think we can re-use the example of the quickstart vignette. It uses Bayesian multiple imputation. I suggest we start implementing the examples from the functions using the code reported in the quickstart vignette, and then if we see that for any example we need a draws object related to a conditional mean imputation approach, I am happy to provide you the code for that.

Kind regards,
Alessandro