Adding guest accounts count telemetry (#14257)

* Adding guest accounts count telemetry

* Adding missed methods to the opentracing an timer layer

store/sqlstore/user_store.go

@@ -1290,6 +1290,14 @@ func (us SqlUserStore) AnalyticsGetInactiveUsersCount() (int64, *model.AppError)
 	return count, nil
 }
 
+func (us SqlUserStore) AnalyticsGetGuestCount() (int64, *model.AppError) {
+	count, err := us.GetReplica().SelectInt("SELECT count(*) FROM Users WHERE Roles LIKE :Roles and DeleteAt = 0", map[string]interface{}{"Roles": "%system_guest%"})
+	if err != nil {
+		return int64(0), model.NewAppError("SqlUserStore.AnalyticsGetSystemAdminCount", "store.sql_user.analytics_get_system_admin_count.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	return count, nil
+}
+
 func (us SqlUserStore) AnalyticsGetSystemAdminCount() (int64, *model.AppError) {
 	count, err := us.GetReplica().SelectInt("SELECT count(*) FROM Users WHERE Roles LIKE :Roles and DeleteAt = 0", map[string]interface{}{"Roles": "%system_admin%"})
 	if err != nil {