feat(safety): implement report content API

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

@@ -0,0 +1,13 @@
+use crate::models::Snapshot;
+use crate::{AbstractSnapshot, Result};
+
+use super::super::MongoDb;
+
+static COL: &str = "safety_snapshots";
+
+#[async_trait]
+impl AbstractSnapshot for MongoDb {
+    async fn insert_snapshot(&self, snapshot: &Snapshot) -> Result<()> {
+        self.insert_one(COL, snapshot).await.map(|_| ())
+    }
+}