support --verbose flag for pkg installer

refs #1976 

basically just adds `-verboseR` to `installer` when `--verbose` flag is specified.

this is a simple implementation - i'd like to revamp the tests around CLI stuff to make them faster, which will include a refactor that will affect the implementation here.

a nice idea down the road would be to parse the `verboseR` output and display a fancy progress bar. :dress: