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

database/factories/EmailLogFactory.php

@@ -32,7 +32,7 @@ class EmailLogFactory extends Factory
             'mailable_type' => $this->faker->randomElement([Invoice::class, Estimate::class, Payment::class]),
             'mailable_id' => function (array $log) {
                 return $log['mailable_type']::factory();
-            }
+            },
         ];
     }
 }