Make a duplicate key warning an exception

[golergka]

Feature Request

I want to be able to configure List components or other components that use it (such as Tree in my particular use case) to throw an exception when it encounters duplicate ids.

• When you provide duplicate ids, the user interface is often completely broken, so it's better to just show "we crashed" instead of ugly tree with different elements on the same place
• When it happens in production, I want to get those errors in Sentry
• I want this to fail unit tests