Feature suggestion: inline-shell

Suggestion: I think this library would be an order of magnitude more useful if it implemented something akin to [inline-C](https://github.com/fpco/inline-c). I.e:

```
main :: IO ()
main = do
x <- [S.block| {
# Print something to console from bash.
echo "Hello from"
} |]
putStrLn $ x ++ " Haskell!"
```
This would allow someone to mix quick bash scripts with the aid of Turtle's typing system.