Function zone_exists 

pub async fn zone_exists(
    client: &Arc<Client>,
    token: Option<&str>,
    zone_name: &str,
    server: &str,
) -> Result<bool>

Check if a zone exists by trying to get its status.

Returns Ok(true) if the zone exists and can be queried, Ok(false) if the zone definitely does not exist (404), or Err for transient errors (rate limiting, network errors, server errors, etc.) that should be retried.

Errors

Returns an error if:

• The server is rate limiting requests (429 Too Many Requests)
• Network connectivity issues occur
• The server returns a 5xx error
• Any other non-404 error occurs