Issue #3519943: add composer.json to define dev dependencies to fix phpstan issues

composer.json

+{
+    "name": "drupal/ui_patterns_paragraphs",
+    "description": "UI Patterns Paragraphs",
+    "license": "GPL-2.0-or-later",
+    "type": "drupal-module",
+    "require-dev": {
+        "drupal/ui_patterns": "^2"
+    }
+}