Add extension template with PHPStan, PHPUnit and phpcs

tools/phpcs/composer.json

@@ -0,0 +1,11 @@
+{
+  "repositories": [
+    {
+      "type": "git",
+      "url": "https://github.com/civicrm/coder.git"
+    }
+  ],
+  "require": {
+    "drupal/coder": "dev-8.x-2.x-civi"
+  }
+}

tools/phpstan/composer.json

@@ -0,0 +1,18 @@
+{
+    "require": {
+        "phpstan/extension-installer": "^1.1",
+        "phpstan/phpstan": "^1.7",
+        "phpstan/phpstan-deprecation-rules": "^1.0",
+        "phpstan/phpstan-phpunit": "^1.1",
+        "phpstan/phpstan-strict-rules": "^1.2",
+        "phpstan/phpstan-webmozart-assert": "^1.2",
+        "thecodingmachine/phpstan-strict-rules": "^1.0",
+        "voku/phpstan-rules": "^3.0"
+    },
+    "config": {
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        },
+        "sort-packages": true
+    }
+}

tools/phpunit/composer.json

@@ -0,0 +1,13 @@
+{
+    "require": {
+        "symfony/phpunit-bridge": "^6.1"
+    },
+    "scripts": {
+        "post-install-cmd": [
+            "@php vendor/bin/simple-phpunit install"
+        ],
+        "post-update-cmd": [
+            "@php vendor/bin/simple-phpunit install"
+        ]
+    }
+}