OnionPerf TGen parser needs reworking
OP builds analysis files from TGen and Tor logs. As described in #29374 (moved), the OP TGen parser only looks at
[transfer-*] lines in the TGen files, which does not correctly calculate start times for transfers which have failed due to errors.
The parser should take into account the source/proxy ports and record the start time of a transfer. This will help build a foundation for completing #29787 (moved), and include error code combinations in from both tor/tgen logs in the produced *.tpf files.