Log server timeouts captured by Cowboy.Handler

[pzhou-thescore]

Notes

• Builds on top of [ 377 ] Add crash_report logger metadata for exceptions captured by Cowboy.Handler #381 to log an erorr with crash_reason metadata when handling server timeouts
• This is useful for reporting timeouts to observability platforms like BugSnag

[sleipnir]

Thank you @pzhou-thescore