modularize monitor, reduce init usage (#81)

* kill process tree using syscall on windows & cleanup (#80)

* kill process tree using syscall on windows & cleanup

* use job api

* add error check for cmd.Start

* modularize monitor, reduce init usage

* replace slices with sort

* update gopsutil & other dependencies

pkg/monitor/load/load.go

@@ -0,0 +1,11 @@
+package load
+
+import (
+	"context"
+
+	psLoad "github.com/shirou/gopsutil/v4/load"
+)
+
+func GetState(ctx context.Context) (*psLoad.AvgStat, error) {
+	return psLoad.AvgWithContext(ctx)
+}