Test: notebook output editing api

[rebornix]

Refs: #115817

• anyOS @lszomoru
• anyOS @meganrogge

Complexity: 4

Authors: @jrieken, @rebornix

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This iteration we revamped the notebook output interface and outputs edit API, with which you can now

• Append outputs to a cell
• Replace outputs in a cell
• Append output items to a cell output
• Replace output items in a cell output

NotebookCellOutput is an object which contains multiple NotebookCellOutputItem, which is the raw output data for a specific mime type.

For example, you can create output with a single mimetype or multiple mimetypes

// renders as a text output `1`
new vscode.NotebookCellOutput([
    new vscode.NotebookCellOutputItem('application/x.notebook.stream', 1),
])

// renders as two outputs
new vscode.NotebookCellOutput([
    new vscode.NotebookCellOutputItem('application/x.notebook.stream', 1),
    new vscode.NotebookCellOutputItem('application/x.notebook.error-traceback', {
        ename: 'error2 not defined',
        evalue: 'console.error2 not defined',
        traceback: [
            'console.error2'
        ]
    }),
])

You use write commands to modify the outputs of GitHub Issue Notebook or tweak https://github.com/rebornix/vscode-notebook-testbed to play around with all kinds of different mimtypes we support internally. Please test:

• The new interface / API is intuitive to use in overall
• Output replacement
• Output appending
  • Try Clear Cell Output when the extension keeps appending outputs
• Output item replacement and appending