Migrate Date Pickers to official

I haven't tried it yet but maybe switch from

implementation 'com.wdullaer:materialdatetimepicker:4.2.3'

to the official [MaterialTimePicker](https://github.com/material-components/material-components-android/tree/master/lib/java/com/google/android/material/timepicker).

It's had changes as recently as a few days ago, but if someone wants me to try it I can. Just checking interest.

Start by locating the Android dependency declaration for com.wdullaer:materialdatetimepicker:4.2.3 and review the official MaterialTimePicker documentation linked in the issue. Determine whether the existing date-picker usage can be migrated, then verify that the app's picker behavior remains covered by its existing checks; done means the old dependency is replaced without regressions.

Written by the indexing model from the issue text.