Context.log does not actually accept or pass forward extra kwargs

[LucasRoesler]

The utility methods on Context for logging all document **extra as being passed forward to the logger. However, Context.log does not actually allow any additional kwargs to be passed. This results in errors such as

Context.log() got an unexpected keyword argument 

To Reproduce
Any usage of the context methods with extra kwargs will produce the error, for example

await context.info(
    "request finished",
    channel_id=channel_id,
    status=response.get("ok"),
)

Expected behavior
The Context.log method is documented with

Args:
  level: Log level (debug, info, warning, error)
  message: Log message
  logger_name: Optional logger name
  **extra: Additional structured data to include

This (and the helper methods) should either be documented as not supporting additional structured data or the log message data needs to be structured, for example, something like this

    async def log(
        self,
        level: Literal["debug", "info", "warning", "error"],
        message: str,
        *,
        logger_name: str | None = None,
        **extra: Any
    ) -> None:
        """Send a log message to the client.

        Args:
            level: Log level (debug, info, warning, error)
            message: Log message
            logger_name: Optional logger name
            **extra: Additional structured data to include
        """
        log_data = {
           "message": message, **extra
        }
        await self.request_context.session.send_log_message(
            level=level, data=log_data, logger=logger_name
        )