This is #3225 + plugging this into the compiler (still not invoked from the compiler though, needs discussion).

@mhevery / @tbosch could we please discuss landing it and the next steps?

As discussed offline: Let's keep as as simple as possible.
I.e. only the abstract class for the SchemaRegistry, and one purely dynamic implementation for .ts and one that always returns true for hasProperty for .dart.

Suppressed by #3353

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