feat: add timeout callback

[chowyu12]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.48148% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 95.12%. Comparing base (8690859) to head (e094fd5).
Report is 45 commits behind head on master.

Additional details and impacted files

Files	Coverage Δ
rest/handler/timeouthandler.go	97.56% <100.00%> (-0.25%)	⬇️
rest/engine.go	98.87% <66.66%> (-1.13%)	⬇️
rest/server.go	95.03% <25.00%> (-1.50%)	⬇️

... and 252 files with indirect coverage changes