Add support for forwarding refs to DatePicker component

[asayyexgq]

Currently, there's no provision for passing a ref to the DatePicker component, limiting our ability to interact with it programmatically. It would be valuable to introduce a ref prop or a method (e.g., getDatePickerRef()) that allows users to forward a ref to the DatePicker component. This enhancement would facilitate tasks like focusing the DatePicker or retrieving its current value.