fix: type ErrorResponse exported as non-type (#745)

Author: gabrielmfern

src/index.ts

@@ -7,7 +7,7 @@ export * from './domains/interfaces';
 export * from './emails/attachments/interfaces';
 export * from './emails/interfaces';
 export * from './emails/receiving/interfaces';
-export { ErrorResponse } from './interfaces';
+export type { ErrorResponse, Response } from './interfaces';
 export { Resend } from './resend';
 export * from './segments/interfaces';
 export * from './webhooks/interfaces';