[#79] Support by_alias in Model Config

[luolingchun]

Checklist:

• Run pytest tests and no failed.
• Run flake8 flask_openapi3 tests examples and no failed.
• Run mypy flask_openapi3 and no failed.
• Run mkdocs serve and no failed.

class BookQuery(BaseModel):
    age: int
    author: str
    metadata: Dict[str, str] = Field(alias='metadata_')

    class Config:
        by_alias = False

    # in pydantic v2.x
    # model_config = ConfigDict(by_alias=False)

With by_alias = False:

Without: