[Datepicker] MatLuxonDateAdapter

[FrankiePo]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

Luxon Date Adapter for datepicker, like the moment one.

What is the current behavior?

There is no built-in support for luxon date library.

What are the steps to reproduce?

What is the use-case or motivation for changing an existing behavior?

The use case is to have built-in Luxon support for datepicker

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 6.0.9, Newest Material, etc

Is there anything else we should know?

[babeal]

I think we are going to build this for our project. Is this something that the material team would like contributed back?

[alexxxxOG]

This is a duplicate of #10427.

[kdrvn]

What is the status on this feature? Is it still being considered?
I wrote an implementation with proper testing for a project, I could wrap it in a PR.

[mmalerba]

This has been implemented and is waiting to be merged: #14681

[jelbourn]

Tracking this in #20599 going forward

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