ENH Check composer.json for module type

[GuySartorelli]

Issue

• Make is_module()and similar methods dynamic and more robust #4

[emteknetnz]

Looks mostly fine

This will be wrong on silverstripe-config which lacks a type

• https://github.com/silverstripe/silverstripe-config/blob/2/composer.json

In case you want to double check stuff I wrote a quite script and ran this on sink

<?php

$types = [];
$unknowns = [];
$minks = [];
$composerPlugins = [];
foreach (['silverstripe', 'cwp'] as $vendor) {
    $d = __DIR__ . "/vendor/$vendor";
    // loop subdirs in $d using scandir
    foreach (scandir($d) as $subdir) {
        // loop files in $subdir
        if ($subdir == '.' || $subdir == '..') {
            continue;
        }
        foreach (scandir("$d/$subdir") as $file) {
            if ($file !== 'composer.json') {
                continue;
            }
            $json = json_decode(file_get_contents("$d/$subdir/$file"), true);
            if (!isset($json['type'])) {
                $unknowns[] = "$d/$subdir/$file";
                continue;
            }
            $type = $json['type'];
            if ($type === 'behat-extension') {
                $behats[] = "$d/$subdir/$file";
            } else if ($type === 'mink-driver') {
                $minks[] = "$d/$subdir/$file";
            } else if ($type === 'composer-plugin') {
                $composerPlugins[] = "$d/$subdir/$file";
            } else {
                $types[$type] ??= 0;
                $types[$type]++;
            }
        }
    }
}

echo "UNKNOWNS\n";
print_r($unknowns);

echo "BEHATS\n";
print_r($behats);

echo "MINKS\n";
print_r($minks);

echo "TYPES\n";
print_r($types);

[GuySartorelli]

Ahh yup fair point. config isn't a Silverstripe CMS module technically, but I'm okay with pretending it is for the purposes of this tool, since we tend to treat it as though it is one.
Done