**Use case**
In some organisations are using AD with hierarchical structure (nested organisation unit) and DN follow this structure. As result we can not  use permanent build_dn for users with different OU.

**Describe the solution you'd like**
Solution can be look like:
1) bind as service account
2) set dn for user_name by some filter string to user_dn
3) bind as user_dn with password
3) use user_dn with filter for group/roles fetching

This approach is implemented in Metabase.

#pragma once
#if !defined(ARCADIA_BUILD)
#   include "config_core.h"
#endif
#include <common/types.h>
#if USE_LDAP
#   include <ldap.h>
#   define MAYBE_NORETURN
#else
#   define MAYBE_NORETURN [[noreturn]]
#endif
#include <chrono>
#include <set>
#include <vector>
namespace DB
{
class LDAPClient