Implement PHP CS Fixer and a coding standard to follow (#471)

* Create PHP CS Fixer config and add to CI workflow

* Run php cs fixer on project

* Add newline at end of file

* Update to use PHP CS Fixer v3

* Run v3 config on project

* Run seperate config in CI

.php-cs-fixer.ci.php

@@ -0,0 +1,43 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__)
+    ->exclude(['bootstrap', 'storage', 'vendor'])
+    ->name('*.php')
+    ->name('_ide_helper')
+    ->notName('*.blade.php')
+    ->ignoreDotFiles(true)
+    ->ignoreVCS(true);
+
+$rules = [
+    '@PSR12' => true,
+    'array_syntax' => ['syntax' => 'short'],
+    'ordered_imports' => ['sort_algorithm' => 'alpha'],
+    'concat_space' => true,
+    'no_unused_imports' => true,
+    'not_operator_with_successor_space' => true,
+    'trailing_comma_in_multiline' => true,
+    'phpdoc_scalar' => true,
+    'unary_operator_spaces' => true,
+    'binary_operator_spaces' => true,
+    'blank_line_before_statement' => [
+        'statements' => ['break', 'continue', 'declare', 'return', 'throw', 'try'],
+    ],
+    'phpdoc_single_line_var_spacing' => true,
+    'phpdoc_var_without_name' => true,
+    'class_attributes_separation' => [
+        'elements' => [
+            'method' => 'one',
+            'property' => 'one',
+        ],
+    ],
+    'method_argument_space' => [
+        'on_multiline' => 'ensure_fully_multiline',
+        'keep_multiple_spaces_after_comma' => true,
+    ],
+];
+
+return (new PhpCsFixer\Config())
+    ->setUsingCache(true)
+    ->setRules($rules)
+    ->setFinder($finder);