feat: add build:test script and improve documentation code blocks

- Added a new script `build:test` to generate test cases from documentation code examples.
- Enhanced documentation files by ensuring proper code block formatting and adding missing closing backticks.
- Updated various markdown files to include new code blocks and fixed formatting issues.

packages/artplayer-vitepress/docs/en/advanced/class.md

@@ -132,4 +132,5 @@ Returns the default options for the player.
 <div className="run-code">▶ Run Code</div>
 
 ```js
-console.info(Artplayer.option);
+console.info(Artplayer.option);
+```