feat: add support for electron_debug.log

[erickzhao]

This PR adds support for electron_debug.log in Sleuth. Chromium logs have a unique format that requires a whole other set of parsers.

A log line looks something like this:

[85509:0307/160606.126448:WARNING:transport_feedback_adapter.cc(263)] Failed to lookup send time for 1 packet. Send time history too small?

Here, the metadata prefixing the message is [process_id:MMDD/hhmmss.SSSSSS:LOG_LEVEL:filename(line)] as documented in https://support.google.com/chrome/a/answer/6271282.

Some notes:

• The timestamp is approximate: we don't have year information, but we assume that logs are fresh and sent within the last year or so.
• Log levels are not standard, so I mapped some obvious ones to the ones that Sleuth uses.
• We can actually link to Chrome's source to find the code where the log file lives! For example: https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/modules/congestion_controller/rtp/transport_feedback_adapter.cc?q=filepath:transport_feedback_adapter.cc&ss=chromium

[erickzhao]

pog