LSP Code Action: Desugar use expression

[lpil]

For example, turning:

use x <- result.map(Ok(1))
io.debug(x)

Into:

result.map(Ok(1), fn(x) { io.debug(x) })

Related to #3311

[giacomocavalieri]

If you had multiple use expressions in a block what would the desired behaviour be?

use x <- result.try(Ok(1))
use y <- result.try(Error(1))
Ok(1)

Desugaring all of them? Or just the one where the cursor is?

result.try(Ok(1), fn(x) {
  use y <- result.try(Error(1))
  Ok(1)
})
// Or all the way down
result.try(Ok(1), fn(x) {
  result.try(Error(1), fn(y) {
    Ok(1)
  })
})

[lpil]

Just one please