add session to visits and events

shared/schema/metrics/VisitSchema.ts

@@ -9,6 +9,7 @@ export type TVisit = {
     continent: string,
     country: string,
 
+    session: string,
     device: string,
 
     website: string,
@@ -26,6 +27,8 @@ const VisitSchema = new Schema<TVisit>({
 
     continent: { type: String },
     country: { type: String },
+    
+    session: { type: String },
 
     device: { type: String },