feat: add ignoreOrder False test

Author: mjhenkes

test/cases/ignoreOrderFalse/e1.css

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+body { content: "e1"; }

test/cases/ignoreOrderFalse/e2.css

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+body { content: "e2"; }

test/cases/ignoreOrderFalse/expected/styles.css

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+body { content: "e2"; }
+
+body { content: "e1"; }
+

test/cases/ignoreOrderFalse/index.js

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+import './e2.css';
+import './e1.css';

test/cases/ignoreOrderFalse/index2.js

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+import './e1.css';
+import './e2.css';

test/cases/ignoreOrderFalse/webpack.config.js

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+import Self from '../../../src';
+
+module.exports = {
+  entry: {
+    entry1: './index.js',
+    entry2: './index2.js',
+  },
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, 'css-loader'],
+      },
+    ],
+  },
+  optimization: {
+    splitChunks: {
+      cacheGroups: {
+        styles: {
+          name: 'styles',
+          chunks: 'all',
+          test: /\.css$/,
+          enforce: true,
+        },
+      },
+    },
+  },
+  plugins: [
+    new Self({
+      ignoreOrder: false,
+    }),
+  ],
+};