refactor: use controller approach in handlers

internal/controller/health_controller.go

@@ -0,0 +1,24 @@
+package controller
+
+import "github.com/gin-gonic/gin"
+
+type HealthController struct {
+	Router *gin.RouterGroup
+}
+
+func NewHealthController(router *gin.RouterGroup) *HealthController {
+	return &HealthController{
+		Router: router,
+	}
+}
+
+func (controller *HealthController) SetupRoutes() {
+	controller.Router.GET("/health", controller.healthHandler)
+}
+
+func (controller *HealthController) healthHandler(c *gin.Context) {
+	c.JSON(200, gin.H{
+		"status":  "ok",
+		"message": "Healthy",
+	})
+}