AI-generated Key Takeaways
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          GMSNavigationRouteCalloutFormatcontrols the display of information (distance or ETA) in route callouts during navigation.
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          It offers three options: default,time, anddistance, allowing developers to customize the callout content.
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          The defaultoption automatically chooses between time and distance based on the selected routing strategy.
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          timedisplays estimated time to reach the destination, whiledistanceshows the remaining distance.
GMSNavigationRouteCalloutFormat
enum GMSNavigationRouteCalloutFormat : NSInteger {}The format specifies whether to show distance or ETA information in route callouts.
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                  Shows the time or distance, depending on the routing strategy. Shows time with the default best routing strategy and distance with the shorter routing strategy. DeclarationSwift case `default` = 0Objective-C GMSNavigationRouteCalloutFormatDefault = 0
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                  Shows time information in route callouts (e.g., 10 min, 5 min faster). DeclarationSwift case time = 1Objective-C GMSNavigationRouteCalloutFormatTime
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                  Shows distance information in route callouts (e.g., 10 km, 5 km longer). DeclarationSwift case distance = 2Objective-C GMSNavigationRouteCalloutFormatDistance