frontend: datetime pickers

[Augustyniak]

Add a datetime picker based off a KeyboardDateTimePicker from material-ui/pickers package. Material UI official docs recommend the use of pickers from this package.

For now, the only way to ask user for a datetime with the use of controls exposed by clutch is to use a TextField which implements this functionality with the use of native controls.

 <TextField type="datetime-local" />

This kind of works but has a few downsides:

• TextField exposes a selected date as a string which makes working with dates harder than necessary - a developer needs to find a way to convert them to Date objects before using them etc.
• It works best in Chrome, Chrome actually allow you to pick the date and the time with the use of nice UI.
• In Safari and Firefox (I have not tested other browsers), the only way for a user to provide date and time is to manually type it in the correct format (that's not obvious to the user).

Chrome	Safari	Firefox

Complexity: M