code: public static function findDangerousChanges(Schema $oldSchema, Schema $newSchema)
      {
          return array_merge(
              self::findArgChanges($oldSchema, $newSchema)['dangerousChanges'],
              self::findValuesAddedToEnums($oldSchema, $newSchema),
              self::findInterfacesAddedToObjectTypes($oldSchema, $newSchema),
              self::findTypesAddedToUnions($oldSchema, $newSchema),
              self::findFieldsThatChangedTypeOnInputObjectTypes($oldSchema, $newSchema)['dangerousChanges']
          );
      }
docs: Given two schemas, returns an Array containing descriptions of all the types
  of potentially dangerous changes covered by the other functions down below.
  
  @return string[][]