feat: add ProcConf to make SetTimeToForceQuit configurable

[WqyJh]

Add ProcConf to ServiceConf, then we can use config file instead of SetTimeToForceQuit to set force quit time.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (8690859) to head (54bae6e).
Report is 159 commits behind head on master.

Additional details and impacted files

Files with missing lines	Coverage Δ
core/proc/shutdown.go	75.51% <100.00%> (+1.59%)	⬆️
core/service/serviceconf.go	90.32% <100.00%> (+0.32%)	⬆️

... and 4 files with indirect coverage changes

[WqyJh]

Could this simple patch be merged? @kevwan