Replace Run Cell/Above/Below command palette commands with actual working commands

[rgson]

In light of issue microsoft/vscode-python#5096, I suggest that the Run Cell, Run Above and Run Below commands (in the command palette) be replaced by Run Current Cell and new, currently non-existent counterparts for cells above/below the cursor's current position.

I imagine behavior consistent with the Run Cell | Run Above | Run Below code lens texts belonging to the cell in which the cursor is currently located.

The commands could perhaps take the names of the current, non-functioning commands and act as one-to-one replacements.

Having functioning commands for these actions would increase productivity by supporting keybindings and a keyboard-only workflow.

I would be willing to create a pull request for this, if the suggestion is approved.

[rchiodo]

We're going to remove the 'Run Below' and 'Run Above' from the command palette and create new commands that do the same thing from the current line/cell where the cursor is.