✨ feat(lib): introduce Result type alias for error handling

- add `Result` type alias for cleaner error handling throughout the crate

src/lib.rs

@@ -24,3 +24,6 @@ pub use message_list::MessageList;
 pub use retention::MessageAge;
 pub use retention::Retention;
 pub use trash::Trash;
+
+/// Type alias for result with crate Error
+pub type Result<O> = std::result::Result<O, Error>;