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/ExpenseCategoryFactory.php

@@ -25,7 +25,7 @@ class ExpenseCategoryFactory extends Factory
         return [
             'name' => $this->faker->word,
             'company_id' => User::where('role', 'super admin')->first()->company_id,
-            'description' => $this->faker->text
+            'description' => $this->faker->text,
         ];
     }
 }