Expose the HiGHS options

[lukas-tallarium]

Hi,

Would it be possible to pass the list of options that HiGHS supports somehow? Here is the list.

I think maybe we could set the options line 22 in highs.ex:

{output, _error_code} =
  System.cmd(command, [
    model_path,
    "--solution_file",
    solution_path
  ])

If you can guide me a bit to make the change properly, happy to write a PR.