Migrate material date- and time pickers from mui/lab to mui/x-date-pickers

[lucas-koehler]

Date pickers failed with recent versions of @mui/lab.
Furthermore, they have officially been moved to @mui/x-date-pickers.
See https://mui.com/blog/lab-date-pickers-to-mui-x/

• Add @mui/x-date-picker peer and dev dependency to the material renderer package
• Remove @mui/lab peer and dev dependency from the material renderer package.
  It was only used for the date and time pickers
• Adapt two unit tests to actually use valid inputs.
• Adapt date and time picker action configuration to new API.
  • Keep the clear button on mobile devices
  • No action buttons on desktop devices (as before)
  • Action button labels (for mobile devices) can no longer be configured via ui schema option due to missing API

Fix #1998

UI differences for mobile devices

Notable differences:

• clear button are no longer left aligned
• button texts are no longer adaptable. This might be addable again in a follow up by providing a custom toolbar. See here as a starting point.

Now

Before

[coveralls]

Coverage remained the same at 84.356% when pulling 67d612c on lucas-koehler:1998-date-pickers into 0f0470f on eclipsesource:master.