Better fix for #96591 to also work correctly with notebooks

In the explorer->open with command, we need to call `getEditorOverrides` but do not have a real editor input. Rather than creating a fake editor input, we should just take uri for `getEditorOverrides`

enable serialized notebook inputs, implement equality check for inputs, https://github.com/microsoft/vscode/issues/93000

use `overrideOpenEditor` to open a cell-uri as notebook editor, use NotebookEditorOptions to reveal/focus a cell