Use argparse subcommands with a single CLI console script

Right now there are multiple CLI console scripts:

* `satproc_extract_chips`
* `satproc_build_dataset`
* `satproc_scale`
* `satproc_match_histograms`
* `satproc_smooth_stitch`
* `satproc_polygonize`

It would be better to have a single `satproc` CLI script and use subcommands like:

`satproc extract_chips`, `satproc scale`, `satproc smooth_stitch` or `satproc polygonize`, etc.