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/TaxFactory.php

@@ -32,7 +32,7 @@ class TaxFactory extends Factory
                 return TaxType::find($item['tax_type_id'])->name;
             },
             'company_id' => User::where('role', 'super admin')->first()->company_id,
-            'amount' => $this->faker->randomDigitNotNull
+            'amount' => $this->faker->randomDigitNotNull,
         ];
     }
 }