feat: initialize basic Symfony project: update composer.json

This was done by executing `symfony local:new sample-app`
and manually merging generated `composer.json` file
with the repository’s `composer.json` file.

composer.json

@@ -23,15 +23,69 @@
   },
   "require": {
     "php": "^8.3",
+    "ext-ctype": "*",
+    "ext-iconv": "*",
     "quintolin/core": "^0.0.3",
-    "quintolin/storage": "^0.0.3"
+    "quintolin/storage": "^0.0.3",
+    "symfony/console": "7.0.*",
+    "symfony/dotenv": "7.0.*",
+    "symfony/flex": "^2",
+    "symfony/framework-bundle": "7.0.*",
+    "symfony/runtime": "7.0.*",
+    "symfony/yaml": "7.0.*"
   },
   "require-dev": {
     "quintolin/coding-standard": "^1.0.3"
   },
+  "conflict": {
+    "symfony/symfony": "*"
+  },
+  "replace": {
+    "symfony/polyfill-ctype": "*",
+    "symfony/polyfill-iconv": "*",
+    "symfony/polyfill-php72": "*",
+    "symfony/polyfill-php73": "*",
+    "symfony/polyfill-php74": "*",
+    "symfony/polyfill-php80": "*",
+    "symfony/polyfill-php81": "*",
+    "symfony/polyfill-php82": "*"
+  },
   "autoload": {
     "psr-4": {
       "App\\": "src/"
     }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "App\\Tests\\": "tests/"
+    }
+  },
+  "minimum-stability": "stable",
+  "prefer-stable": true,
+  "config": {
+    "allow-plugins": {
+      "php-http/discovery": true,
+      "symfony/flex": true,
+      "symfony/runtime": true
+    },
+    "sort-packages": true
+  },
+  "scripts": {
+    "auto-scripts": {
+      "cache:clear": "symfony-cmd",
+      "assets:install %PUBLIC_DIR%": "symfony-cmd"
+    },
+    "post-install-cmd": [
+      "@auto-scripts"
+    ],
+    "post-update-cmd": [
+      "@auto-scripts"
+    ]
+  },
+  "extra": {
+    "symfony": {
+      "allow-contrib": false,
+      "require": "7.0.*"
+    }
   }
 }