Teach engine/src/sky/tools/gn and BUILD.gn files about --deploy mode

[eseidelGoogle]

Let's start with Android. @johnmccutchan tells me that there is a PRODUCTION flag for Dart we could turn on as a simple first step. In later iterations we can add AOTC, etc.

@devoncarew will wire in the tool bits with #3262, hopefully @jason-simmons or @chinmaygarde are willing to do the script and GN changes.

[johnmccutchan]

I will be landing a CL shortly which adds a gn arg dart_product set it to true.

[Hixie]

How does this differ from "release"?

[jason-simmons]

The debug/profile/release runtime modes are now available in the engine and in flutter_tools

[github-actions]

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