recursively create directories if it does not exist
See also
Other path helpers:
check_in_paths(),
check_out_paths(),
eval_cmd(),
safe_to_write(),
stop_if_dne(),
stop_if_e()
Examples
out_dir <- file.path(tempdir(), "eepR-example-dir")
mkdir_if_dne(out_dir)
dir.exists(out_dir)
#> [1] TRUE