v0.34.0 - Migrate components from @material-ui to @mui/material

We now use the latest @mui version!

• migrate all the @material-ui components to the @mui/material package;
• migrate the <Autocomplete /> component from @material-ui/lab to @mui/material;
• migrate the <KeyboardDatePicker />, <KeyboardTimePicker /> and <KeyboardDateTimePicker /> components from the @material-ui/pickers to the new @mui/x-date-pickers package;
• removed the <ChipField /> component and the material-ui-chip-input package, from now on, to use a field with chips, it can be used directly from the <Autocomplete multiple /> component;
• removed the @material-ui/core, @material-ui/lab and @material-ui/pickers packages.