Generating under Windows does not compute relative path correctly

[jausions]

Describe the bug

Under Windows, running the command to generate code includes a relative path to the configuration file that goes all the way to the root of the Windows drive. So instead of having something like that:

    public static function config(): string
    {
        return \Safe\realpath(__DIR__ . '/../../../../../sailor.php');
    }

We obtain something like the following:

    public static function config(): string
    {
        return \Safe\realpath(__DIR__ . '/../../../../../../C:\Users\johndoe\Documents\dev\project\website\sailor.php');
    }

Expected behavior/Solution

Regardless of operating system, we should get the short form of relative path.

Steps to reproduce

1. Be under Windows
2. Run the code generator

Output/Logs

Nothing of importance.

How to get around the issue

Change \Spawnia\Sailor\Codegen\Generator::configPath this way:

    protected function configPath(string $directory): string
    {
        // $from = explode('/', $directory);
        // $to = explode('/', $this->configFile);
        $from = preg_split('~[\\\\/]~', $directory);
        $to = preg_split('~[\\\\/]~', $this->configFile);

I am not having much time on my hand to do a PR. If nobody does, I'll see if I can get to it.

[spawnia]

I have never used PHP on Windows and I have no plans to do it, so supporting it is really low on my list of priorities. If you can provide a merge request that fixes the issue, I will consider it. If possible, it should add tests, preferrably by setting up automated tests that run on Windows in GitHub actions.