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/component/controls.md

@@ -174,4 +174,5 @@ art.on('ready', () => {
             ],
         });
     }, 3000);
-});
+});
+```