[Catalog][DatePicker][TimePicker] listener is cleared after rotating device

[manabu-nakamura]

Description: The listener is cleared after rotatinf the device.
(Case 1) Catalog app:

1. Open a DatePicker.
   
3. Select any date.
4. Press Cancel button or OK button. -> The Snackbar is shown.
   

(Case 2) Catalog app:

1. Open a DatePicker.
2. Rotate the device.
3. Select any date.
4. Press Cancel button or OK button. -> The Snackbar is NOT shown.

Expected behavior: The listener is not cleared after rotatinf the device. I think it is difficult to workaround this issue because MaterialDatePicker is final. Refine the API and/or the docs.

Source code: https://github.com/material-components/material-components-android/blob/master/catalog/java/io/material/catalog/datepicker/DatePickerMainDemoFragment.java#L164-L166

MaterialDatePicker<?> picker = builder.build();
addSnackBarListeners(picker);
picker.show(getChildFragmentManager(), picker.toString());

Minimal sample app repro: https://github.com/material-components/material-components-android/tree/master/catalog

Android API version: 35

Material Library version: 1.13.0-alpha09

Device: Emulator 35.2.10