`JSON` attributes do not show up as valid json in event attributes

先从报告中展示的 handler 的 emit 方法和 HTTPLogItem 构造开始，然后跟踪 log_ctx 如何通过 LogsApi.submit_log 进行序列化。使用 x_request_body 重现 logger.debug 示例，并验证已提交事件的属性保留有效的 JSON 对象值，而不是显示为字符串。

Describe the bug
A clear and concise description of what the bug is.
When a valid json is passed as value of a custom event atrribute, In logs it is show as a string and not a json object

To Reproduce

# in the handler

    def emit(self, record):
        env = os.getenv("APP_ENV", "local")
        log_ctx: LogCtxDict = record.__dict__.get("log_ctx", {})
        tags_dict = log_ctx.pop('tags', {})
        tags = [f"{k}:{v}" for k, v in tags_dict.items()]
        tags.append("env:{}".format(env))
        tags_merged = ",".join(tags)
        body = HTTPLog(
            [
                HTTPLogItem(
                    ddsource="python",
                    ddtags=tags_merged,
                    hostname="vv-anyscale-ray-aps1",
                    message=self.format(record),
                    service="vv-ap-thumbnails-v1-{}-service".format(env),
                    timestamp=str(datetime.fromtimestamp(record.created).astimezone().timestamp()),
                    level=record.levelname.lower(),
                    **record.__dict__.get("log_ctx", {})
                )
            ]
        )
        try:
            with ApiClient(self.dd_configuration) as api_client:
                resp = LogsApi(api_client).submit_log(content_encoding=ContentEncoding.GZIP, body=body)
                if "errors" in resp:
                    self.handleError(record)

        except (Exception, ):
            self.handleError(record)




logger.debug(
    "Test debug log",
    log_ctx={
        "x_request_body": json.dumps({"clip_id": "66abc57369bbe0000782ef42"}),
    }
)

Expected behavior
A clear and concise description of what you expected to happen.
The object should be consumed and shown as json,

Screenshots
If applicable, add screenshots to help explain your problem.

Environment and Versions (please complete the following information):
A clear and precise description of your setup:

$ poetry show datadog-api-client
 name         : datadog-api-client                         
 version      : 2.27.0                                     
 description  : Collection of all Datadog Public endpoints 

dependencies
 - certifi *
 - python-dateutil *
 - typing-extensions >=4.0.0
 - urllib3 >=1.15

for logs parsing default python pipleline is used