[feat] add export as dataset

src/ts/storage/exportAsDataset.ts

@@ -0,0 +1,29 @@
+import { get } from "svelte/store";
+import { DataBase } from "./database";
+import { downloadFile } from "./globalApi";
+import { alertNormal } from "../alert";
+import { language } from "src/lang";
+
+export async function exportAsDataset(){
+    const db = get(DataBase)
+
+    let dataset = []
+    for(const char of db.characters){
+        if(char.type === 'group'){
+            continue
+        }
+        for(const chat of char.chats){
+            
+            dataset.push({
+                character: char.name,
+                description: char.desc,
+                chats: chat.message,
+            })
+        }
+    }
+
+    await downloadFile('dataset.json',Buffer.from(JSON.stringify(dataset, null,4), 'utf-8'))
+
+    alertNormal(language.successExport)
+    
+}