AI-generated Key Takeaways
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          GADMediationBannerAd represents a rendered banner ad that provides a single subview for placement within a banner view's hierarchy. 
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          The viewproperty provides access to the banner ad's UIView.
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          The -changeAdSizeTo:method allows for resizing the banner ad content if it is resizable.
GADMediationBannerAd
@protocol GADMediationBannerAd <GADMediationAd>Rendered banner ad. Provides a single subview to add to the banner view’s view hierarchy.
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                  The banner ad view. DeclarationSwift var view: UIView { get }Objective-C @property (nonatomic, readonly, nonnull) UIView *view;
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                  Tells the ad to resize the banner. Implement if banner content is resizable. DeclarationSwift optional func changeSize(to adSize: AdSize)Objective-C - (void)changeAdSizeTo:(GADAdSize)adSize;