This is a new feature. I've needed support for selecting a full week for a given date instead of an arbitrary range. Thought this might also be useful for others considering that various date picker libraries also support this.

What is the new behavior?
When picker property "type" is set to "week" hovering on a single date will highlight the full week that date belongs to (adhering to specified 'firstDayOfWeek' value).

Selecting a week this way will select all the dates in the week as opposed to the just the last and first dates as in the range date picker (see attached screenshot). This seemed more intuitive to me; i.e. if an user click on Wednesday only having Mon, Sun directly selected and just highlighting the days in between felt strange to me (also I needed a full list of dates in my use case anyway..). If others disagree I can make this behave the same way as the "range" picker.

Checklist:

• Documentation
• Tests
• Ready to be merged

No documentation, tests or support for locales other than 'en-US' will add that in an updated PR (assuming that you agree that this feature should be added at all
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