feat: implement structured logging with new slog package and Manager struct

- Add new `slog` package
- Implement `Manager` struct to handle logging
- Add `New` function to create a new `Manager` instance
- Implement `Infof`, `Errorf`, `Fatalf`, `Debugf` methods for formatted logging
- Implement `Info`, `Error`, `Fatal`, `Debug` methods for unformatted logging

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Author: appleboy

slog/slog.go

@@ -0,0 +1,54 @@
+package slog
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+)
+
+// New to create new interface for logger
+func New() *Manager {
+	return &Manager{
+		logger: slog.New(slog.NewTextHandler(os.Stdout, nil)),
+	}
+}
+
+// Manager for slog
+type Manager struct {
+	logger *slog.Logger
+}
+
+func (l Manager) Infof(format string, args ...interface{}) {
+	l.logger.InfoContext(context.Background(), fmt.Sprintf(format, args...))
+}
+
+func (l Manager) Errorf(format string, args ...interface{}) {
+	l.logger.ErrorContext(context.Background(), fmt.Sprintf(format, args...))
+}
+
+func (l Manager) Fatalf(format string, args ...interface{}) {
+	l.logger.ErrorContext(context.Background(), fmt.Sprintf(format, args...))
+	os.Exit(1)
+}
+
+func (l Manager) Debugf(format string, args ...interface{}) {
+	l.logger.DebugContext(context.Background(), fmt.Sprintf(format, args...))
+}
+
+func (l Manager) Info(args ...interface{}) {
+	l.logger.InfoContext(context.Background(), fmt.Sprint(args...))
+}
+
+func (l Manager) Error(args ...interface{}) {
+	l.logger.ErrorContext(context.Background(), fmt.Sprint(args...))
+}
+
+func (l Manager) Fatal(args ...interface{}) {
+	l.logger.ErrorContext(context.Background(), fmt.Sprint(args...))
+	os.Exit(1)
+}
+
+func (l Manager) Debug(args ...interface{}) {
+	l.logger.DebugContext(context.Background(), fmt.Sprint(args...))
+}