fix: handle 404 errors, fix error handling for client.resolve

[yusefnapora]

This fixes a couple things related to error handling:

• W3NameClient::resolve now actually checks the status code of the API response and returns errors
• APIError now includes the HTTP status code
• The cli now prints an error report to stderr on failure and calls process::exit instead of panicking
• The cli's publish command now only falls back to creating an initial revision if the request for the current revision returns 404. Other errors are treated as failures and printed. Closes #4