**Use case**
ClickHouse as a web server becomes a viable scenario.
(At least in backoffice).

**Describe the solution you'd like**
Add this field.

**Additional context**
It's in question how to name it. The original HTTP specs has the famous typo in it and name it `referer`. While JavaScript has this typo fixed and name it `referrer`.

#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeFactory.h>
#include <Interpreters/ProcessList.h>
#include <Storages/System/StorageSystemProcesses.h>
#include <Interpreters/Context.h>
#include <Core/Settings.h>
#include <Interpreters/ProfileEventsExt.h>
#include <Common/typeid_cast.h>
#include <Common/IPv6ToBinary.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnArray.h>
namespace DB
{
NamesAndTypesList StorageSystemProcesses::getNamesAndTypes()