Material-ui-pickers: Feature Request: Seconds input option for DateTime Component

[natecartwright]

Thanks for the great component!

When editing a Javascript Date object, it's useful to be able to edit seconds along with the date/hours/minutes. Currently only the TimePicker component supports entering seconds. Having the option to enter seconds on the DateTimePicker component would be very handy. The only way to edit a timestamp date object and edit seconds currently is to use manual entry, or to use separate date/time components.

[VMBindraban]

Just noticed that we are also missing this feature.

[dmtrKovalenko]

We will not do that. It is actually design issue - there is no place for additional button.