BXC-5606 - HTTP API for register and deregister event

[bbpennel]

https://unclibrary.atlassian.net/browse/BXC-5606

• Allow application to be run as a puma application, with roda for its web framework
• Add API endpoints for registering and deregistering files
  • Supports all the same options as the CLI, but bundled as a JSON object in the body of the request
  • Other than basic param validation, most errors will come back as 500 responses currently since
• Change selection option parser to throw exceptions for validation errors rather than exiting, since this would be bad in a persistent application