[Android] Create `DatePickerDialog` on demand

[OvrBtn]

Description of Change

This PR is an addition to https://github.com/dotnet/maui/pull/24948 and it further improves performance of first render of DatePicker by creating DatePickerDialog on demand instead of on control render.

Issues Fixed

Fixes https://github.com/dotnet/maui/issues/24929

Blockers

This PR should be merged after https://github.com/dotnet/maui/pull/20547 is merged since it might break workarounds like this one https://github.com/dotnet/maui/issues/12899#issuecomment-1403661769