✨ feat(utils): add test utils module

- add test_utils module to provide common utilities for tests
- add get_test_logger function for initializing test logger

src/lib.rs

@@ -13,6 +13,8 @@ mod message_list;
 mod retention;
 mod rule_processor;
 mod rules;
+#[cfg(test)]
+pub(crate) mod test_utils;
 
 pub(crate) mod utils;