add STREAM_BW event handler
|Reported by:||robinson||Owned by:||atagar|
Adds STREAM_BW event handler class and tests.
This patch series includes an aliasing of is_valid_circuit_id to is_valid_stream_id. I am not sure how to provide context to the associated pydoc to keep it linked to the alias assignment.
These patches may not want to apply cleanly due to my end-of-file configuration instructions to my text editor. But, the changes are whitespace clean and do not add anything but working code. Hopefully, I will not continue working near the end of files and this will not crop up again.