core library updates for super-initializer parameters

[devoncarew]

See #48055 for the main tracking issue.

[devoncarew]

cc @lrhn

[lrhn]

There are no necessary changes to the platform libraries for super-initializer parameters.

We can consider whether we want to showcase the feature in some cases where it applies. I don't expect that to be many cases in public classes, since we often have a public interface/private implementation separation, where users won't see the actual generative constructors.