Add actions for manipulating notebook cells

[pokey]

We currently have a "cell" scope type, but it only supports the "pour" action. For example, you can say "pour cell" and "pour cell air", but not "swap cell air with bat", etc.

• Handle ranges of cells as well as single cells and lists of cells

Actions to support

• "bring"
• "move"
• "swap"
• "chuck"
• "pour"
• "drink"
• "clear"
• "copy"
• "carve"
• "paste"
• "clone"
• "clone up"
• "fold"
• "unfold"
• "center"
• "drop"?
• "float"?

Implementation

We should be able to implement some of them by simply selecting the cell and then running a notebook command. VSCode has lots of notebook commands; try saying "please notebook" with a notebook open.

Other commands will take a bit more care for example move and bring. We should be able todo these by eg selecting one or more cells and repeating a move-downwards command multiple times

Could possibly just use the CommandAction class, though might need to tweak to support multi-cell selection. It's worth checking though for each of the given actions whether there is a vscode action which accepts a cell as an argument, tho this seems quite unlikely

Helpful links

• The focusNotebookCell function has examples of getting notebook cell from editor and manipulating notebook selections at cell level
• Example of a test for notebook cell operation https://github.com/pokey/cursorless-vscode/blob/main/src/test/suite/crossCellsSetSelection.test.ts
• EditNew has an example of overriding action behaviour for notebook cell target