Add script used to assist with building triptych screen config

[jzimbel-mbta]

Asana task: Synthesize Outfront + station survey docs into draft triptych screen configs

I wrote this script to help me avoid some typos/mistakes while building the triptych config.

I figured it might be worthwhile to save this for later, in case we need to mass-configure the triptychs on another subway line in the future.

• Tests added?

[github-actions]

Coverage of commit b2042b2

Summary coverage rate:
  lines......: 40.8% (2287 of 5612 lines)
  functions..: 42.1% (1047 of 2486 functions)
  branches...: no data found

Files changed coverage rate: n/a

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[hannahpurcell]

So nifty! Thanks for committing this

(that makes it sound like a CRIME lol)