[TIMOB-26617] iOS : Add click event listener to the back-button of a Window (part of the NavigationWindow)

Use case: We want to run some code first before closing the window without creating a custom back-button which is not easy to create exactly looking button as native iOS provides on a Window. In Android, we can add a custom method to onHomeIconItemSelected for the up-arrow icon to call our custom method where we can even close the window. In iOS: We cannot call any method upon clicking the back-button of Window where we can run some validations before closing the window. Current Solution: Create left-nav button with a back arrow icon and set click event listener to it. This is not a proper way as the padding, size, back-icon are very hard to match as provided by native iOS Window itself. So we should add similar property or override iOS back-button click event. See attached screenshot for clear understanding.