No stack trace in the log when an exception occurs

[takahashi-shotaro-al]

(at least in emulated callable functions), No stack trace in the log when an exception occurs, making it difficult to identify the cause.

>  ERROR:root:Unhandled error: list index out of range
i  functions: Finished "test" in 1998.7598480000001ms

Perhaps the stack trace is not output this line. https://github.com/firebase/firebase-functions-python/blob/8610670b7cf9ecf79666fae50651509a71176a84/src/firebase_functions/https_fn.py#L410

[exaby73]

Hello. Stack traces are currently not supported in Python Cloud Functions hence no stack currently

[CorieW]

Closing as similar to #172