Allow running in vanilla PHP projects

[timacdonald]

The symfony/process is a hard requirement for the project but is no included in the dependency list.

shiki-php/src/Shiki.php

Lines 64 to 72 in 1895983

	$command = [
	(new ExecutableFinder())->find('node', 'node', [
	'/usr/local/bin',
	'/opt/homebrew/bin',
	$home . '/n/bin', // support https://github.com/tj/n
	]),
	'shiki.js',
	json_encode(array_values($arguments)),
	];

shiki-php/src/Shiki.php

Lines 82 to 84 in 1895983

	if (! $process->isSuccessful()) {
	throw new ProcessFailedException($process);
	}

This means the package is not usable outside of projects that already depend on symfony/process. I hit this on a recent project and had to manually install symfony/process even though I was not interacting with it directly.

I tested 5.0, 6.0, and 7.0 against the testsuite and static analysis and all the tests passed on my machine and not additional static analysis issues were introduced with either version.

[riasvdv]

Thanks!