feat(safety): fetch reports and fetch snapshot API

crates/quark/src/impl/dummy/safety/report.rs

@@ -9,4 +9,8 @@ impl AbstractReport for DummyDb {
         info!("Insert {:?}", report);
         Ok(())
     }
+
+    async fn fetch_reports(&self) -> Result<Vec<Report>> {
+        Ok(vec![])
+    }
 }

crates/quark/src/impl/dummy/safety/snapshot.rs

@@ -9,4 +9,8 @@ impl AbstractSnapshot for DummyDb {
         info!("Insert {:?}", snapshot);
         Ok(())
     }
+
+    async fn fetch_snapshot(&self, _report_id: &str) -> Result<Snapshot> {
+        todo!()
+    }
 }