Offline Region Observer
            A region can have a single observer, which gets notified whenever a change to the region's status occurs.
Functions
mapbox Tile Count Limit Exceeded
                          
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                        Implement this method to be notified when the limit on the number of Mapbox tiles stored for offline regions has been reached.
response Error
                          
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                        Implement this method to be notified of errors encountered while downloading regional resources.
status Changed
                          
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                        Implement this method to be notified of a change in the status of an offline region.