Is your feature request related to a problem? Please describe.

All the igx input components have an asterisk added when the input control is required in the form, except for the igx-date-picker.

Describe the solution you'd like

Add the asterisk (*) to the label of the igx-date-picker

Describe alternatives you've considered

Currently we're manually editing the label of the date picker

Additional context

Please also consider the UI changes when this control is invalid.