✨ feat(lib): add error module and export it

- introduce a new error module for standardized error handling
- export the Error type for external use

src/lib.rs

@@ -6,9 +6,11 @@
 
 mod client;
 mod credential;
+mod error;
 mod list;
 
 pub use client::get_auth;
 pub use client::get_client;
 pub use credential::Credential;
+pub use error::Error;
 pub use list::List;