Add a CSV listing import script

[anders-schneider]

Issue

Addresses #227

• This change addresses the issue in full
• This change addresses only certain aspects of the issue
• This change is a dependency for another issue
• This change has a dependency from another issue

Description

This change adds a CSV listing import script, and it is intended to be used specifically for the data in the HRD listing spreadsheet. It reuses the existing listings-importer.ts library. (Aside: the listings-importer.ts library has a bug, and this change does not attempt to fix that bug - that work is happening separately.)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Prototype/POC (not to merge)
• This change is a refactor/address technical debt
• This change requires a documentation update
• This change requires a SQL Script

How Can This Be Tested/Reviewed?

I tested this by running the script, and checking that each of the fields that should have been populated were in fact populated correctly in the DB.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have reviewed the changes in a desktop view
• I have reviewed the changes in a mobile view
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have assigned reviewers
• I have updated the changelog to include a description of my changes