Notebook: test notebook serializer

[jrieken]

Refs: #122922

• anyOS @lramos15
• anyOS @TylerLeonhardt

Complexity: 3

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This test plan item is about the registerNotebookSerializer-API. Test that

• you can use the API without using proposed API
• the function and the notebooks-contribution point is sufficiently documented so that you can write a toy notebook

Focus on the serializer only, there are test plan items for controller and status bar item provider. When you are stuck take a look at the regex-notebook toy sample