Configures Julia and installs required Julia packages for EpiAwareR. If a `julia` version is pinned in upstream EpiAware's Project.toml, that version is installed via [juliaup](https://github.com/JuliaLang/juliaup) and used; otherwise the system Julia is used.
epiaware_setup_julia(verbose = TRUE)Invisible TRUE on success.
Heavy lifting (subprocess install, lazy-init guard) is delegated to [juliaready::julia_ready()].
if (FALSE) { # \dontrun{
epiaware_setup_julia()
} # }