Add php-cs-fixer with @psr2 ruleset and additional rules for better r…

…eadability along with automated file header copyright.

Signed-off-by: Ghazi Triki <[email protected]>

composer.json

@@ -22,6 +22,7 @@
         "ext-json": "*"
     },
     "require-dev": {
+        "friendsofphp/php-cs-fixer": "^v3.54.0",
         "php-parallel-lint/php-parallel-lint": "^1.3.1",
         "phpdocumentor/shim": "^3",
         "phpunit/phpunit": "^9.5",
@@ -36,6 +37,7 @@
         }
     },
     "scripts": {
+        "cs-fix": "PHP_CS_FIXER_IGNORE_ENV=1 ./vendor/bin/php-cs-fixer fix",
         "phpdoc": "vendor/bin/phpdoc",
         "phpcs": "vendor/bin/phpcs -sp --colors",
         "phpcbf": "vendor/bin/phpcbf -sp",