Define a formater to sort imports (isort-like)

[jimenezrick]

It's a bit counterintuitive but ruff by default doesn't sort imports (as explained in astral-sh/ruff#8367). Could we add a second formatter doing it as documented? The user would simply need to add a second hook to trigger it:

(reformatter-define ruff-isort
    :program ruff-format-command
    :args (list "check" "--select" "I" "--fix" "--stdin-filename" (or (buffer-file-name) input-file))
    :lighter " RuffIsort"
    :group 'ruff-format)

Thanks!