Support for quick change to raw cell

[YongcaiHuang]

in Jupyter Notebook, there is a keyboard shortcut pressing R to change a cell into raw text, which is convenient when some cells do not need to run but still keep it. However, in VSCode Notebook, I need to click the language at the bottom right of each cell to change into the raw cell. it would be great if we have some ways to quick change cell into raw with keyboard shortcut.