feat(Date Picker): Basic date picker

[Frly]

Demo

[jelbourn]

@Frly please follow the process in our contributing guide.

This starts by opening an issue (or commenting on the appropriate issue) that you'd like to contribute a feature. We can discuss contributions from there.

Any code that is contributed has to follow our practices, including:

• Support for accessibility
• Support for i18n (RTL)
• Support for theming
• Unit tests
• Following our coding standards
• Using existing infrastructure (such as the Overlay service)

In particular, with the datepicker, we're not quite ready to go into implementation because a revision for the Material Design spec is in the works.

[Frly]

demo

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