add opentelemetry tracing

internal/common/config/http.go

@@ -3,5 +3,4 @@ package config
 type HTTP struct {
 	ListenAddr string `json:"listen_addr"`
 	MountLive  bool   `json:"mount_live"`
-	Engine     string `json:"engine"`
 }

internal/common/config/trace.go

@@ -0,0 +1,6 @@
+package config
+
+type Trace struct {
+	Endpoint   string `json:"endpoint"`
+	LicenseKey string `json:"license_key"`
+}