Test notebook serializer API

[jrieken]

Refs: #119089

• anyOS @alexdima
• anyOS @JacksonKearl

Complexity: 3

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We have added a new notebook serializer API. It allows you to implement a simple read/write but no execute notebook in VS Code. Focus on the following two APIs

• in package.json use the notebookProvider contribution points
• in your extension use the vscode.notebook.registerNotebookSerializer API

If you have time write a simple extension or review the regex notebook extension. When using the API make sure that

• the API works
• the API is easy to use and properly documented

[jrieken]

fyi - use the vscode-dts-utility to use the latest version of vscode.proposed.d.ts

[JacksonKearl]

Wasn't able to get it working with untitled notebooks, that seems to be a separate issue with working copy service. Other than that it's nice to use and sure beats registerNotebookContentProvider