harmony 鸿蒙窗口管理子系统JS API变更

窗口管理子系统JS API变更

OpenHarmony 3.2 Canary1版本相较于OpenHarmony 3.1 Release版本，窗口管理子系统的API变更如下:

模块名	类名	方法/属性/枚举/常量	变更类型
ohos.window	WindowStage	loadContent(path: string, storage: ContentStorage, callback: AsyncCallback<void>): void; loadContent(path: string, storage?: ContentStorage): Promise<void>; loadContent(path: string, callback: AsyncCallback<void>): void;	新增
ohos.window	WindowStage	getSubWindow(): Promise<Array<Window>>; getSubWindow(callback: AsyncCallback<Array<Window>>): void;	新增
ohos.window	WindowStage	createSubWindow(name: string): Promise<Window>; createSubWindow(name: string, callback: AsyncCallback<Window>): void;	新增
ohos.window	WindowStage	getMainWindow(): Promise<Window>; getMainWindow(callback: AsyncCallback<Window>): void;	新增
ohos.window	WindowStageEventType	BACKGROUND	新增
ohos.window	WindowStageEventType	INACTIVE	新增
ohos.window	WindowStageEventType	ACTIVE	新增
ohos.window	WindowStageEventType	FOREGROUND = 1	新增