test(utils): 添加事件驱动模型测试

- 在 sqrt_test.go 中添加了 fastSqr1 测试函数，用于测试事件驱动模型
- 新增了 Event 和 Uint32AsyncEvent 类型用于测试
- 更新了 go.work、go.mod 和

common/utils/event/test_scenarios/fire-and-forget/main_test.go

@@ -0,0 +1,49 @@
+package fire_and_forget
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/badu/bus"
+	"github.com/badu/bus/test_scenarios/fire-and-forget/audit"
+	"github.com/badu/bus/test_scenarios/fire-and-forget/events"
+	"github.com/badu/bus/test_scenarios/fire-and-forget/notifications"
+	"github.com/badu/bus/test_scenarios/fire-and-forget/users"
+)
+
+func OnDummyEvent(event *events.DummyEvent) {
+	fmt.Println("dummy event async ?", event.Async())
+}
+
+func TestUserRegistration(t *testing.T) {
+	var sb strings.Builder
+
+	userSvc := users.NewService(&sb)
+	notifications.NewSmsService(&sb)
+	notifications.NewEmailService(&sb)
+	audit.NewAuditService(&sb)
+
+	bus.Sub(OnDummyEvent)
+
+	userSvc.RegisterUser(context.Background(), "Badu", "+40742222222")
+
+	<-time.After(500 * time.Millisecond)
+
+	userSvc.RegisterUser(context.Background(), "Adina", "+40743333333")
+
+	<-time.After(500 * time.Millisecond)
+
+	const expecting = "user Badu has registered - sending welcome email message\n" +
+		"sms sent requested for number +40742222222 with message Badu your user account was created. Check your email for instructions\n" +
+		"audit event : an sms was successfully sent sent to +40742222222 with message Badu your user account was created. Check your email for instructions\n" +
+		"user Adina has registered - sending welcome email message\n" +
+		"sms sent requested for number +40743333333 with message Adina your user account was created. Check your email for instructions\n"
+
+	got := sb.String()
+	if got != expecting {
+		t.Fatalf("expecting :\n%s but got : \n%s", expecting, got)
+	}
+}