feat: unpack payload into log function

Pass down the payload dict (merged from the ? querystring and POST data, depending on context) and pass it to the log function. In my specific case, I was looking to do analysis on around how much of the calls to `ChartDataRestApi.data` are using "force=true", and realize while this is in context, it doesn't flow through my current logger. By adding this one line of code, it should allow for many more (in fact ALL querystring and POST payload) parameters to flow through the logger. From there custom loggers can have access to much more context. Note that by default, the loggers we have won't do anything with the new arguments passed, and essentially flush it.

superset/config.py

@@ -79,6 +79,8 @@
 
 # By default will log events to the metadata database with `DBEventLogger`
 # Note that you can use `StdOutEventLogger` for debugging
+# Note that you can write your own event logger by extending `AbstractEventLogger`
+# https://github.com/apache/superset/blob/master/superset/utils/log.py
 EVENT_LOGGER = DBEventLogger()
 
 SUPERSET_LOG_VIEW = True

superset/utils/log.py

@@ -207,6 +207,7 @@ def log_with_context(  # pylint: disable=too-many-locals,too-many-arguments
             slice_id=slice_id,
             duration_ms=duration_ms,
             referrer=referrer,
+            payload=payload,
             **database_params,
         )