Warn developers if they are using `List<int>` or `List<double>` where they could safely use a typed data list

For example, a `List` of 1000 entries will use at least 64 * 1000 bits.

If that list will only ever contain small numbers, a Int32/Int16/Int8List would use less memory.

We should check if this would help some of our larger applications, and if so, find a way to add a warning to devtools.

/cc @jacob314

该 issue 未指定任何文件、测试或入口点。首先评估类型化数据列表是否能使提到的较大型应用受益，然后确定 DevTools 可以在哪里显示警告。完成的标准是已确定其益处，并定义了具体的警告方案。

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