quality of life tweaks after trying to use kernel sidecar in a plugin

src/nb_builder.rs

@@ -38,6 +38,10 @@ impl NotebookBuilder {
         self.nb.read().await.save(filename);
     }
 
+    pub async fn dumps(&self) -> String {
+        self.nb.read().await.dumps()
+    }
+
     pub async fn get_cell(&self, id: &str) -> Option<Cell> {
         let nb = self.nb.read().await;
         for cell in nb.cells.iter() {

src/notebook.rs

@@ -50,6 +50,10 @@ impl Notebook {
         let js = serde_json::to_string_pretty(&self).expect("Failed to serialize notebook on save");
         std::fs::write(filename, js).unwrap();
     }
+
+    pub fn dumps(&self) -> String {
+        serde_json::to_string_pretty(&self).expect("Failed to serialize notebook on save")
+    }
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, EnumAsInner)]