How can I implement a global error handler (middleware) in Go to catch errors from all GraphQL resolvers?

Most Go GraphQL libraries provide a mechanism to register middleware. This middleware intercepts every GraphQL request and response. Within the middleware, you can wrap resolver execution using `defer...recover()` blocks to catch panics or inspect error responses. You can log all errors from this central point and format and potentially modify the error response before sending it back to the client. This offers a single point for handling all server errors.