feat(ScriptAPI): add support for retrieving current plugin information

Author: leoweyr

platforms/javascript/src/ScriptAPI/Li.d.ts

@@ -90,6 +90,11 @@ declare namespace ll {
    */
   function getPluginInfo(name: string): Plugin
 
+  /**
+   * 获取当前插件的信息
+   */
+  function getCurrentPluginInfo(): Plugin
+
   /**
    * 列出所有已加载的插件
    * @returns 列出所有已加载的插件