Matt Perry 81b2b81b1d Replace C++ UpdateTask with an empty dart version, loaded as a snapshot.
This adds a new placeholder dart package updater in sky/packages. This is built
into a snapshot and compiled into the Sky engine binary using the same
mechanism as the Dart isolate.

I also added a SkyHeadless class, similar to SkyView, used for running Dart
code without a view.
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