support screen.devicePixelRatio

[PPpro]

Re: cocos-creator/3d-tasks#

Changelog:

• 支持 screen.devicePixelRatio 只读属性，该属性返回的是引擎当前使用的 DPR

[github-actions]

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -16581,9 +16581,9 @@
         /**
          * @en Returns device pixel ratio for retina display.
          * @zh 返回设备或浏览器像素比例。
          *
-         * @deprecated since v3.4.0, devicePixelRatio is a concept on web standard.
+         * @deprecated since v3.4.0, please use screen.devicePixelRatio instead.
          */
         getDevicePixelRatio(): number;
         /**
          * @en Returns the real location in view for a translation based on a related position
@@ -47669,8 +47669,16 @@
          * @zh screen 单例对象提供简单的方法来做屏幕管理相关的工作。
          */
         export class cocos_core_platform_screen_Screen {
             /**
+             * @en the ratio of the resolution in physical pixels to the resolution in CSS pixels for the current display device
+             * NOTE: For performance reasons, the engine will limit the maximum value of DPR on some platforms.
+             * This property returns the DPR after the engine limit.
+             * @zh 当前显示设备的物理像素分辨率与 CSS 像素分辨率之比
+             * 注意：出于性能考虑，引擎在一些平台会限制 DPR 的最高值，这个属性返回的是引擎限制后的 DPR。
+             */
+            get devicePixelRatio(): number;
+            /**
              * @en Get and set the size of current window in physical pixels.
              * NOTE:
              * - Setting window size is only supported on Web platform for now.
              * - On Web platform, if the ContainerStrategy is PROPORTIONAL_TO_FRAME, we set windowSize on game frame,