extract_stan_draws: Helper function to extract draws from popReconstruct stan...
In ihmeuw-demographics/popMethods: Methods for Population Estimation

Helper function to extract draws from popReconstruct stan fits

1	extract_stan_draws(fit, inputs, settings, detailed_settings)

`fit`	[`stanfit(1)`] or [`sdreport(1)`] Model fit object returned by `popReconstruct_fit()`.
`inputs`	[`list()`] [`data.table()`] for each ccmpp input. Requires 'srb', 'asfr', 'baseline'; mortality estimates provided as just 'survival' or two of 'mx', 'ax', and 'qx'; and migration estimates provided as just 'net_migration' or both 'immigration' and 'emigration'. See Section: Inputs for more information on each of the required inputs.
`settings`	[`list()`] Named list of settings for running the popReconstruct model with. The required settings are the same as those required for `demCore::ccmpp()`, see Section: Settings for these. The optional settings specific to popReconstruct are described in Section: Optional popReconstruct Settings
`detailed_settings`	[`list()`] Detailed settings for each ccmpp input and 'population'.