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/users/service.go

@@ -0,0 +1,25 @@
+package users
+
+import (
+	"context"
+	"strings"
+
+	"github.com/badu/bus"
+	"github.com/badu/bus/test_scenarios/fire-and-forget/events"
+)
+
+type ServiceImpl struct {
+	sb *strings.Builder
+	c  int
+}
+
+func NewService(sb *strings.Builder) ServiceImpl {
+	result := ServiceImpl{sb: sb}
+	return result
+}
+
+func (s *ServiceImpl) RegisterUser(ctx context.Context, name, phone string) {
+	s.c++
+	bus.Pub(events.UserRegisteredEvent{UserName: name, Phone: phone})
+	bus.Pub(&events.DummyEvent{AlteredAsync: s.c%2 == 0}) // nobody listens on this one
+}