feat: add db.debug for debug related functions

packages/core/api/debug.js

@@ -0,0 +1,14 @@
+export default class Debug {
+  strip(item) {
+    return JSON.stringify({
+      type: item.type,
+      notebooks: item.notebooks,
+      tags: item.tags,
+      id: item.id,
+      contentId: item.contentId,
+      dateEdited: item.dateEdited,
+      dateDeleted: item.dateDeleted,
+      dateCreated: item.dateCreated,
+    });
+  }
+}