feat(user/bk_this-date): Add script to print dow for given dom

- Note: script name: bk_this-date-in-recent-years.sh

- Note: The script prints out an iso-8601 date string followed by the
  day of the week for the most recent 10 years or a specified date
  range. Useful for determining likely years a month-day combination
  occured when the day of the week is known.