支持更多音视频格式，添加点播测试页面

Example/SellyCloudSDK/Play/AVVodItemModel.h

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+//
+//  AVVodItemModel.h
+//  SellyCloudSDK_Example
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface AVVodItemModel : NSObject
+
+@property (nonatomic, copy) NSString *url;
+@property (nonatomic, copy) NSString *cover;
+@property (nonatomic, copy) NSString *title;
+@property (nonatomic, copy) NSString *type;  // mp4, hls, flv, etc.
+
++ (instancetype)modelWithUrl:(NSString *)url
+                       cover:(NSString *)cover
+                       title:(NSString *)title
+                        type:(NSString *)type;
+
+@end
+
+NS_ASSUME_NONNULL_END

Example/SellyCloudSDK/Play/AVVodItemModel.m

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+//
+//  AVVodItemModel.m
+//  SellyCloudSDK_Example
+//
+
+#import "AVVodItemModel.h"
+
+@implementation AVVodItemModel
+
++ (instancetype)modelWithUrl:(NSString *)url
+                       cover:(NSString *)cover
+                       title:(NSString *)title
+                        type:(NSString *)type {
+    AVVodItemModel *model = [[AVVodItemModel alloc] init];
+    model.url = url;
+    model.cover = cover;
+    model.title = title;
+    model.type = type;
+    return model;
+}
+
+@end