Support Ctrl + U/W shortcuts on FSI

[Swoorup]

Linux, mac users will appreciate if Ctrl/Control keys works in FSI

The usual norm is

• Ctrl + U -> Cut all characters from the cursor to the beginning of the line
• Ctrl + W -> Cut word from the cursor backwards

What works:
Ctrl + A -> Move cursor to beginning works
Ctrl + E -> Move cursor to end of line works

Currently it just prints out weird characters on pressing those keywords:

[cartermp]

I think this would be fine. Would you like to submit a PR? The code would likely live here: https://github.com/dotnet/fsharp/blob/main/src/fsharp/fsi/console.fs