Reading used address file method

Alternatives to this process (NOTE: It looks like process has changed slightly since I wrote the alternative methods, so they might not work exactly as written anymore):
https://github.com/ScotGovAnalysis/cssampling/blob/2c98c18a1e20848ff96b2a995f6ff460d8181c01/scripts/02_used_addresses.R#L38-L46

1. Using purrr as used elsewhere in the project anyway:

usedaddresses <- previoussamples.path %>%
  purrr::map(\(x) haven::read_sas(x, col_select = "UDPRN") %>%
    mutate(survey = x), .progress = TRUE) %>%
  purrr::list_rbind()

2. Using furrr

future::plan(future::multisession, workers = 8)

usedaddresses <- previoussamples.path %>%
  furrr::future_map_dfr(\(x) haven::read_sas(x, col_select = "UDPRN") %>%
    mutate(survey = x), .progress = TRUE)