fix windows #32

[kiyoon]

Fixes #32

Additionally:

1. Able to pass multiple arguments for the commands during setup. Example:

require("jupynium").setup({
  python_host = { "conda", "run", "--no-capture-output", "-n", "base", "python" },
  jupyter_command = { "conda", "run", "--no-capture-output", "-n", "base", "jupyter" },
})