For [the rule in the list](https://github.com/ClickHouse/ClickHouse/blob/82fc7375dd3ac4faae6c3b0db9f3a28fb2802d05/tests/config/top_level_domains/public_suffix_list.dat#L6430) `*.sch.uk` 

and domain like `www.something.sheffield.sch.uk`  the correct / expected result is `sheffield.sch.uk`

Example with python (correct)

```
-- pip install publicsuffix2
-- python3
>>> from publicsuffix2 import get_public_suffix
>>> get_public_suffix('www.something.sheffield.sch.uk')
'something.sheffield.sch.uk'
```

Same from clickhouse:
```
SELECT cutToFirstSignificantSubdomain('www.something.sheffield.sch.uk')

Query id: 9661461f-a393-43ea-97a1-47c0a8850515

┌─cutToFirstSignificantSubdomain('www.something.sheffield.sch.uk')─┐
│ sch.uk                                                           │
└──────────────────────────────────────────────────────────────────┘
```

/cc @azat 
#pragma once
#include <base/defines.h>
#include <base/StringRef.h>
#include <Common/HashTable/StringHashSet.h>
#include <Common/Arena.h>
#include <Poco/Util/AbstractConfiguration.h>
#include <mutex>
#include <string>
#include <unordered_map>
namespace DB
{
class TLDList
{
public:
    using Container = StringHashSet<>;
    explicit TLDList(size_t size);
    
    bool insert(StringRef host);
    
    bool has(StringRef host) const;
    size_t size() const { return tld_container.size(); }
private:
    Container tld_container;
    std::unique_ptr<Arena> pool;
};
class TLDListsHolder