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/cpu/cpu.go

@@ -0,0 +1,50 @@
+package cpu
+
+import (
+	"context"
+	"fmt"
+
+	psCpu "github.com/shirou/gopsutil/v4/cpu"
+)
+
+type CPUHostType string
+
+const CPUHostKey CPUHostType = "cpu"
+
+func GetHost(ctx context.Context) ([]string, error) {
+	ci, err := psCpu.InfoWithContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	cpuModelCount := make(map[string]int)
+	for _, c := range ci {
+		cpuModelCount[c.ModelName]++
+	}
+
+	var cpuType string
+	if t, ok := ctx.Value(CPUHostKey).(string); ok {
+		cpuType = t
+	}
+
+	var ch []string
+	u := len(ci) > 1
+	for model, count := range cpuModelCount {
+		if u {
+			ch = append(ch, fmt.Sprintf("%s %d %s Core", model, count, cpuType))
+		} else {
+			ch = append(ch, fmt.Sprintf("%s %d %s Core", model, ci[0].Cores, cpuType))
+		}
+	}
+
+	return ch, nil
+}
+
+func GetState(ctx context.Context) ([]float64, error) {
+	cp, err := psCpu.PercentWithContext(ctx, 0, false)
+	if err != nil {
+		return nil, err
+	}
+
+	return cp, nil
+}