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/NoteFactory.php

@@ -24,7 +24,7 @@ class NoteFactory extends Factory
         return [
             'type' => $this->faker->randomElement(['Invoice', 'Estimate', 'Payment']),
             'name' => $this->faker->word,
-            'notes' => $this->faker->text
+            'notes' => $this->faker->text,
         ];
     }
 }