Go: tracing framework (#17004)

### Summary

Tracing framework

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

internal/admin/router.go

@@ -34,7 +34,6 @@ func NewRouter(handler *Handler) *Router {
 
 // Setup setup routes
 func (r *Router) Setup(engine *gin.Engine) {
-
 	SetupEERouter(engine)
 
 	// Healthz to get system health

internal/admin/router_ee.go

@@ -16,8 +16,9 @@
 
 package admin
 
-import "github.com/gin-gonic/gin"
+import (
+	"github.com/gin-gonic/gin"
+)
 
 func SetupEERouter(engine *gin.Engine) {
-
 }

internal/router/router.go

@@ -18,7 +18,6 @@ package router
 
 import (
 	"github.com/gin-gonic/gin"
-
 	"ragflow/internal/common"
 	"ragflow/internal/handler"
 )
@@ -125,7 +124,6 @@ func NewRouter(
 
 // Setup setup routes
 func (r *Router) Setup(engine *gin.Engine) {
-
 	SetupEERouter(engine)
 
 	// Mark all responses from Go with a header for debugging.

internal/router/router_ee.go

@@ -16,8 +16,9 @@
 
 package router
 
-import "github.com/gin-gonic/gin"
+import (
+	"github.com/gin-gonic/gin"
+)
 
 func SetupEERouter(engine *gin.Engine) {
-
 }

internal/server/server_ee.go

@@ -16,7 +16,12 @@
 
 package server
 
-import "errors"
+import (
+	"context"
+	"errors"
+
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+)
 
 var serverEE *EEServer
 
@@ -25,20 +30,22 @@ func init() {
 }
 
 type EEServer struct {
+	tracerProvider *sdktrace.TracerProvider
 }
 
 func newEEServer() *EEServer {
 	return &EEServer{}
 }
 
-func StartServer() error {
+func StartServer(ctx context.Context, serverName string) error {
 	if serverEE == nil {
 		return errors.New("server EE is nil")
 	}
+
 	return nil
 }
 
-func ShutdownServer() error {
+func ShutdownServer(ctx context.Context) error {
 	if serverEE == nil {
 		return errors.New("server EE is nil")
 	}