Migrate ECS config to PHP format.

ecs.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+use Symplify\EasyCodingStandard\Configuration\Option;
+use Symplify\EasyCodingStandard\ValueObject\Set\SetList;
+use Symplify\CodingStandard\Fixer\LineLength\LineLengthFixer;
+
+return static function (ContainerConfigurator $containerConfigurator): void {
+    $parameters = $containerConfigurator->parameters();
+    $parameters->set(Option::SETS, [
+        SetList::CLEAN_CODE,
+        SetList::PSR_12,
+        SetList::SYMFONY,
+        //SetList::SYMPLIFY
+    ]);
+
+    $parameters->set(Option::PATHS, [
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ]);
+
+    $parameters->set(Option::SKIP, [
+        LineLengthFixer::class => null
+    ]);
+};

ecs.yaml

@@ -1,18 +0,0 @@
-parameters:
-  sets:
-    - "psr12"
-    - "php70"
-    - "php71"
-    - "clean-code"
-    - "common"
-    # very nice to have ↓
-    # - "symplify"
-    - "symfony"
-
-  paths:
-    - 'src'
-    - 'tests'
-
-  skip:
-    Symplify\CodingStandard\Fixer\Naming\PropertyNameMatchingTypeFixer: ~
-    Symplify\CodingStandard\Fixer\LineLength\LineLengthFixer: ~