feat(drawer): add rail drawer support

[Jordan-Hall]

Add rail support for the drawer.

Added a new mode for drawer rail mode="rail" inline with https://material.io/components/navigation-rail

This PR will resolve #1728 #1728

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[Jordan-Hall]

@googlebot I signed it!

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[mmalerba]

This needs further design discussion between the Angular Components and MDC teams before we can proceed. The spec seems to consider the navigation drawer and navigation rail to be different components. It may make sense to combine them, but I don't think this is something we can say for sure without further discussion.

[Jordan-Hall]

@mmalerba the specs state its different, however then it goes onto say it can be used as a drawer. Angular Material still need a different component for rail itself. But it doesn't make sense to add the drawer functionality into rail itself

[Char2sGu]

Useful features are always deposited

[Jordan-Hall]

@googlebot I fixed it

[devversion]

Hey, please re-open the pull request if still valid. The PR got auto-closed by GitHub when we renamed our primary branch.

[Jordan-Hall]

Hey, please re-open the pull request if still valid. The PR got auto-closed by GitHub when we renamed our primary branch.

Depends if you want it. Still have it updated on a separate package. But last thing I heard, you was waiting on specs from material design.

[devversion]

I can't unfortunately give you a better response/update here since I haven't been involved in potential discussions here with the Material Design team. It's great to hear that you are maintaining this effort as a separate project though.

I would need to defer for updates/feedback on this to @mmalerba.

[mmalerba]

The spec for the drawer/sidenav has changed pretty significantly from when this components was authored. I think we still want to rethink the API as a whole rather than adding a rail mode to the current API, but thank you for maintaining it separately for those who need it now.

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