- update: database client to implement a database trait so we can mock it out

- update unit tests
- add: database client mock

auth-service/src/lib.rs

@@ -8,4 +8,7 @@ pub mod auth {
 }
 pub mod database {
     tonic::include_proto!("database"); // Matches package name in database.proto
-}
+}
+
+#[cfg(test)]
+pub mod mocks;