**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.

{
    std::scoped_lock lock(mutex);
    return memory_storage.findAll(type);
}
bool LDAPAccessStorage::existsImpl(const UUID & id) const
{
    std::scoped_lock lock(mutex);
    return memory_storage.exists(id);
}
AccessEntityPtr LDAPAccessStorage::readImpl(const UUID & id) const
{
    std::scoped_lock lock(mutex);
    return memory_storage.read(id);
}
String LDAPAccessStorage::readNameImpl(const UUID & id) const
{
    std::scoped_lock lock(mutex);
    return memory_storage.readName(id);
}
bool LDAPAccessStorage::canInsertImpl(const AccessEntityPtr &) const
{
    return false;
}
UUID LDAPAccessStorage::insertImpl(const AccessEntityPtr & entity, bool)
{
    throwReadonlyCannotInsert(entity->getType(), entity->getName());
}
void LDAPAccessStorage::removeImpl(const UUID & id)