TomohikoKanayama

Hi,team👋 Only the test was described for now. Because it could be a major structural reform, I would like to discuss whether I should fix the implementation before proceeding. Closes：https://github.com/ota42y/openapi_parser/issues/156

## Failure that occurred Validation fails when using `oneOf` and `properties` in parallel. ``` one_of_alongside_properties: additionalProperties: false required: - shared_property properties: shared_property: type: string oneOf: - $ref: '#/components/schemas/one_of_object1' - $ref:...