feat: add markdown gfm extension support (#8)

#### What type of PR is this?

/kind feature

#### What this PR does / why we need it:

为 markdown 编辑块增加 GFM 回显支持。

#### How to test it?

使用如下语法：

```
- [x] Write the press release
- [ ] Update the website
- [ ] Contact the media
```

保存之后刷新，查看任务列表是否还存在。

#### Which issue(s) this PR fixes:

Fixes #6 

#### Does this PR introduce a user-facing change?
```release-note
为 markdown 编辑块增加 GFM 回显支持
```

console/package.json

@@ -19,6 +19,7 @@
     "@lezer/highlight": "1.1.6",
     "marked": "^9.1.2",
     "turndown": "^7.1.2",
+    "turndown-plugin-gfm": "^1.0.2",
     "vue": "^3.3.4"
   },
   "devDependencies": {

console/src/editor/markdown-edited.ts

@@ -7,6 +7,7 @@ import { Fragment } from "@tiptap/pm/model";
 import { markdown } from "@codemirror/lang-markdown";
 import { marked } from "marked";
 import TurndownService from "turndown";
+import { gfm } from "turndown-plugin-gfm";
 import { ToolboxItem } from "@halo-dev/richtext-editor";
 import type { EditorState } from "@tiptap/pm/state";
 import MdiPencilOutline from "~icons/mdi/pencil-outline";
@@ -19,6 +20,7 @@ const turndownService = new TurndownService({
   bulletListMarker: "-",
   codeBlockStyle: "fenced",
 });
+turndownService.use(gfm);
 
 declare module "@tiptap/core" {
   interface Commands<ReturnType> {