Add traceback info to common error handler (#1708)

When an internal server error
occurs, the logged error is not really useful for the user.
For example, a `KeyError` will only print the missing key instead of the
full stacktrace and error.

Adding it to the common error handler as that one is meant to catch all
remaining errors, `HTTPException`s are handled by another error handler.

connexion/middleware/exceptions.py

@@ -52,7 +52,7 @@ class ExceptionMiddleware(StarletteExceptionMiddleware):
 
     @staticmethod
     def common_error_handler(_request: StarletteRequest, exc: Exception) -> Response:
-        logger.error(exc)
+        logger.error(exc, exc_info=exc)
 
         response = InternalServerError().to_problem()