The `targetId` argument in `evaluate` might not be a library ID

DWDS currently assumes that the `targetId` argument in `evaluate` is always a library ID:

https://github.com/dart-lang/webdev/blob/6cad2b0021072bb773d1dd621b9d03a3ecebf602/dwds/lib/src/services/chrome_proxy_service.dart#L621

This is not the case, `targetId` might be a library, class or instance: https://github.com/dart-lang/webdev/blob/6cad2b0021072bb773d1dd621b9d03a3ecebf602/dwds/lib/src/services/chrome_proxy_service.dart#L621

Start at dwds/lib/src/services/chrome_proxy_service.dart around line 621 and trace how evaluate uses targetId. Check how library, class, and instance targets are represented and handled there; done means evaluate no longer assumes targetId is always a library ID.

Written by the indexing model from the issue text.