Types show differently in VSCode and DevTools

Platforms: macos, (soon web as well, after https://github.com/dart-lang/webdev/pull/2103)

**VSCode**

**DevTools**

**Questions**

- Should we display types similarly in VSCode and DevTools?
- Should we make the representation realistic, i.e. if the field is showing in DevTools/VSCode then the user can access it via expression evaluation, unless it is shown as private?
- Currently `0.runtimeType.name` field is not accessible (does not compile) but shows in DevTools
- Currently `(0,1).runtimeType.$1` is not accessible (does not compile) but shows in VSCode

Related: https://github.com/dart-lang/webdev/pull/2103

首先使用 issue 中的示例，比较相同类型在 VSCode 和 DevTools 中的呈现方式，并审阅相关的 webdev pull request。当项目为这些类型确定了一种一致的表示方式，并明确是否必须通过表达式求值访问所显示的成员时，即视为完成。

由索引模型根据 Issue 内容生成。