Help dynamic analysis by providing locations on objects returned from VMSerice calls

[annagrin]

go/static-dynamic-angular-dart

Angular Dart Dynamic analysis need connection to code, for example, locations on classes and other objects returned from the VMService.

https://pub.dev/documentation/vm_service/latest/vm_service/Class/location.html

We can get this information from debug symbols when they are supported:
dart-lang/sdk#40273