Add script to extract usernames from issues and comments

[AndreaGriffiths11]

• scripts/extract_usernames.js

  • Use GitHub API to fetch issues and comments
  • Parse issue body and comments to extract usernames
  • Print extracted usernames to console
  • Save extracted usernames to a file
  • Allow specifying issue number as a command-line argument

• package.json

  • Add script entry for extract_usernames.js
  • Add dependencies for GitHub API and file system modules

• .github/workflows/extract_usernames.yml

  • Add GitHub Actions workflow to run extract_usernames.js
  • Trigger workflow on issue creation and comment events
  • Use actions/checkout@v2 to check out repository
  • Use actions/setup-node@v2 to set up Node.js
  • Run extract_usernames.js script