Implement non-function type alias support in web debuggers

[leafpetersen]

This issue tracks support of the non-function type alias feature. See the enclosing meta-issue for details.

cc @franklinyow @sigmundch @mit-mit

[sigmundch]

I don't believe there is any specific work required for this, other than validating that the feature works as expected.

@jacob314 @grouma - do you agree?

[grouma]

Yeah I think we just need to validate that it works and if it doesn't, likely make edits to the logic here.

[leafpetersen]

@grouma do we have a plan for validating this?

[grouma]

I think making use of the feature in a package:dwds smoke test, along with some specific VM Service protocols, should give us enough confidence.

[sigmundch]

Maybe it is worth also adding a couple tests to cover #44925 as well?

[grouma]

Wouldn't hurt. We'll need to know the SDK version that contains these features.

[leafpetersen]

@grouma this will be released in 2.13 are you waiting on a dev build or can you go ahead and validate? This CL can be patched in to build a version with the feature on by default.

[grouma]

Ping me when a dev build is available. It's much easier to validate that way.

[franklinyow]

It seems we won't have a dev build this week due to Easter holiday in Europe , can we validate with the CL?