External script support: get_info

Could add to our ext_scripts:
https://github.com/pcdshub/pcdsutils/blob/e8b308c08afdfa8d4bc0f75d07deea2f46704a39/pcdsutils/ext_scripts.py#L1

get_info does a lot of stuff, including the ability to access which hutch station you're on:

(pcds-5.3.0) [klauer@psbuild-rhel7-01  typhos]$ get_info --help
usage: get_info [-h] [--run] [--exp] [--live] [--ended] [--hutch HUTCH]
                [--station STATION] [--getHutch] [--gethutch] [--getstation]
                [--getbase] [--getinstrument] [--getcnf]
                [--files_for_run FILES_FOR_RUN]
                [--nfiles_for_run NFILES_FOR_RUN] [--setExp SETEXP]

optional arguments:
  -h, --help            show this help message and exit
  --run                 get last run
  --exp                 get experiment name
  --live                ongoing?
  --ended               ended
  --hutch HUTCH         get experiment for hutch xxx
  --station STATION     optional station for hutch with two daqs, e.g. cxi and
                        mfx
  --getHutch            get hutch (uppercase)
  --gethutch            get hutch (lowercase)
  --getstation          get hutch station (for multiple daqs)
  --getbase             get base daq name (hutch_station if multiple daqs,
                        otherwise hutch)
  --getinstrument       get instrument (HUTCH_station if multiple daqs,
                        otherwise hutch)
  --getcnf              get cnf file name)
  --files_for_run FILES_FOR_RUN
                        get xtc files for run
  --nfiles_for_run NFILES_FOR_RUN
                        get xtc files for run
  --setExp SETEXP       set experiment name

Start by reading the referenced pcdsutils/ext_scripts.py and comparing its existing external-script support with the get_info command and options listed in the issue. Confirm which get_info behavior belongs in ext_scripts, then verify that the requested hutch, station, run, experiment, and file-related operations are exposed and usable.