Add perfectionist to our eslint plugins

To have a consistent style of our code we could either use prettier or
use eslint. While there are arguments on both sides I personally prefer
eslint, especially since prettier's fixed text width often decreases
readability.

Author: stschulte

eslint.config.js

@@ -1,6 +1,7 @@
 import eslint from "@eslint/js";
+import stylistic from "@stylistic/eslint-plugin";
 import gitignore from "eslint-config-flat-gitignore";
-import perfectionist from 'eslint-plugin-perfectionist'
+import perfectionist from "eslint-plugin-perfectionist"
 import tseslint from "typescript-eslint";
 
 export default tseslint.config(
@@ -23,5 +24,10 @@ export default tseslint.config(
     files: ['**/*.js'],
     ...tseslint.configs.disableTypeChecked,
   },
-  perfectionist.configs["recommended-natural"]
+  perfectionist.configs["recommended-natural"],
+  stylistic.configs.customize({
+    indent: 2,
+    quotes: "single",
+    semi: true,
+  })
 );