Default Hardware Back Btn Handler
Interface used by DeviceEventManagerModule to delegate hardware back button events. It's suppose to provide a default behavior since it would be triggered in the case when JS side doesn't want to handle back press events.
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By default, all onBackPress() calls should not execute the default backpress handler and should instead propagate it to the JS instance. If JS doesn't want to handle the back press itself, it shall call back into native to invoke this function which should execute the default handler