Test finalized drop in editor api

[mjbvz]

Test for #142990

• Mac @alexdima
• Linux @karthiknadig
• Windows @andreamah

Complexity: 5

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Summary

The drop into editor api has been finalized! This api lets extension hook into when something is dropped on a text editor

Testing

Use the drop into editor sample extension to test this API. Some things to test:

• Check the documentation of the various api types
• Check that you can handle drops from the VS Code explorer and from the OS
• Try returning a workspace edit on DocumentDropEdit (for example, creating a new file)
• Check that setting workbench.editor.dropIntoEditor.enabled disabled dropping into the editor
• Try dropping into notebook cells

[andreamah]

Works super well! 😊