A health check endpoint for your Plack app

Changes for v0.2.0 - 2024-04-08T15:25:55Z

• Update README and LICENSE (Andrew Hewus Fresh)
• Correct POD (Andrew Hewus Fresh)
• Pull request #6: SM-4772 add support for list_tags query parameter (Austin Hill)
• SM-4772 use a separate endpoint under healthz (Austin Hill)
• SM-4772 simplify response code logic (Austin Hill)
• SM-4772 add support for list_tags query parameter (Austin Hill)