List files and stream (non-spatial) table from within a tarball on CRAN.

(we need dev gdalraster for the full dir/vsitar listing capability, but reading from remote files or archives is available in many GDAL versions and existing supported GDAL packages on CRAN)

cransrc <- "https://cran.r-project.org/src/contrib" 
library(gdalraster)  ## for listing dirs recursively we need gh:USDAForestService/gdalraster for now
#> GDAL 3.10.0dev-449d5f09b7, released 2024/08/26, GEOS 3.12.2, PROJ 9.4.1

## list all R packages .tar.gz