Use material-ui pickers for date inputs

[LorenzHenk]

Description

We should consider using the new @material-ui/pickers for date inputs.

The problem here is, that it introduces another (peer)Dependency (@material-ui/pickers), which itself adds a peer dependency (date formatting library of your choice).

I'm not certain whether or not this is worth it.

[lamuertepeluda]

I'd really like to have pickers, no matter if they are a peer or an optional dependency

[lamuertepeluda]

Btw this package did it, although with too much customizations in the dependencies, in my opinions

[lamuertepeluda]

Maybe this one is a better example. But I like your TS approach more.