init/service_parser: Add arguments `window' and `target' for `critical'

The critical services can now using the interface `critical
[window=<fatal crash window mins>] [target=<fatal reboot target>]` to
setup the timing window that when there are more than 4 crashes in it,
the init will regard it as a fatal system error and reboot the system.

Config `window=${zygote.critical_window.minute:-off}' and
`target=zygote-fatal' for all system-server services, so platform that
configures ro.boot.zygote_critical_window can escape the system-server
crash-loop via init fatal handler.

Bug: 146818493
Change-Id: Ib2dc253616be6935ab9ab52184a1b6394665e813
diff --git a/init/service.h b/init/service.h
index 34ed5ef..bc5c90f 100644
--- a/init/service.h
+++ b/init/service.h
@@ -155,6 +155,8 @@
     android::base::boot_clock::time_point time_started_;  // time of last start
     android::base::boot_clock::time_point time_crashed_;  // first crash within inspection window
     int crash_count_;                     // number of times crashed within window
+    std::chrono::minutes fatal_crash_window_ = 4min;  // fatal() when more than 4 crashes in it
+    std::optional<std::string> fatal_reboot_target_;  // reboot target of fatal handler
 
     std::optional<CapSet> capabilities_;
     ProcessAttributes proc_attr_;