An AdUnitSize represents the size of an ad in an ad unit. This also represents the
            environment and companions of a particular ad in an ad unit. In most cases, it is a simple size
            with just a width and a height (sometimes representing an aspect ratio).
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
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                         The permissible creative size that can be served inside this ad unit.  | 
                  
                        
                           
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                         The environment type of the ad unit size. The default value is EnvironmentType.BROWSER. Enumerations 
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                         The companions for this ad unit size. Companions are only valid if the environment is EnvironmentType.VIDEO_PLAYER. If the environment is EnvironmentType.BROWSER including companions results in an error.  | 
                  
                        
                           
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                            The full (including companion sizes, if applicable) display string of the size, e.g.   | 
                  
                        
                           
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                            Whether the inventory size is audio. If set to true,   |