**Describe the bug**
Table creation with named tuples is broken

**How to reproduce**
ClickHouse server version 20.5.3.27

```
:) SELECT version();

┌─version()─┐
│ 20.5.3.27 │
└───────────┘
```
```
:) CREATE TABLE test.tuple
(
    `j` Tuple( a Int8, b String)
)
ENGINE = Memory;


Received exception from server (version 20.5.3):
Code: 62. DB::Exception: Received from localhost:9000. DB::Exception: Syntax error (data type): failed at position 9: Int8, b String). Expected one of: LIKE, GLOBAL NOT IN, AS, IS, OR, QuestionMark, BETWEEN, NOT LIKE, AND, Comma, alias, IN, Dot, NOT, Arrow, token, NOT IN, GLOBAL IN.
```
```
:) CREATE TABLE test.tuple_from_select
ENGINE = Memory AS
SELECT CAST((1, 'Test'), 'Tuple( a Int8,  b String)') AS j;


Received exception from server (version 20.5.3):
Code: 62. DB::Exception: Received from localhost:9000. DB::Exception: Syntax error (data type): failed at position 9: Int8, b String). Expected one of: LIKE, GLOBAL NOT IN, AS, IS, OR, QuestionMark, BETWEEN, NOT LIKE, AND, Comma, alias, IN, Dot, NOT, Arrow, token, NOT IN, GLOBAL IN.
```

**This works fine on 20.4.6.53:**
```
:) SELECT version();

┌─version()─┐
│ 20.4.6.53 │
└───────────┘
```
```
:) CREATE TABLE test.tuple
(
    `j` Tuple( a Int8, b String)
)
ENGINE = Memory;

Ok.
```
```
:) SHOW CREATE TABLE test.tuple

┌─statement───────────────────────────────────────────────────────────────────────┐
│ CREATE TABLE test.tuple
(
    `j` Tuple(
    a Int8, 
    b String)
)
ENGINE = Memory │
└─────────────────────────────────────────────────────────────────────────────────┘
```
```
:) CREATE TABLE test.tuple_from_select
ENGINE = Memory AS
SELECT CAST((1, 'Test'), 'Tuple( a Int8,  b String)') AS j;

Ok.
```
database->attachDictionary(dictionary_name, DictionaryAttachInfo{query_ptr, config, modification_time});
    }
    else
        database->createDictionary(context, dictionary_name, query_ptr);
    return {};
}
BlockIO InterpreterCreateQuery::execute()
{
    auto & create = query_ptr->as<ASTCreateQuery &>();
    if (!create.cluster.empty())
    {
        
        bool force_backward_compatibility = !context.getSettingsRef().show_table_uuid_in_table_create_query_if_not_nil;
        
        
        if (!force_backward_compatibility && !create.attach && create.uuid == UUIDHelpers::Nil)
            create.uuid = UUIDHelpers::generateV4();
        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccess());
    }
    context.checkAccess(getRequiredAccess());
    ASTQueryWithOutput::resetOutputASTIfExist(create);
    
    if (!create.database.empty() && create.table.empty())
        return createDatabase(create);
    else if (!create.is_dictionary)
        return createTable(create);
    else
        return createDictionary(create);
}
AccessRightsElements InterpreterCreateQuery::getRequiredAccess() const