**Describe the issue**
Can't insert `String` data to column with `LowCardinality` type.

Starting from 21.1 this query fails

**How to reproduce**
```sql
CREATE TABLE default.lc_test
(   
    `id` LowCardinality(String)
)
ENGINE = MergeTree
PARTITION BY tuple()
ORDER BY id;

Ok.
0 rows in set. Elapsed: 0.003 sec.


insert into lc_test values (toString('a'));
Exception on client:
Code: 49. DB::Exception: Bad cast from type DB::ColumnString to DB::ColumnLowCardinality: data for INSERT was parsed from query

```

**Additional context**
related to issue https://github.com/DarkWanderer/ClickHouse.Client/issues/66

version 20.12 ok
{
    size_t elements_num = nested_types.size();
    info.special_parser.nested_types.reserve(elements_num);
    for (auto & nested_type : nested_types)
    {
        
        bool is_nullable = false;
        if (const auto * nullable = dynamic_cast<const DataTypeNullable *>(nested_type.get()))
        {
            nested_type = nullable->getNestedType();
            is_nullable = true;
        }
        WhichDataType type_info{nested_type};
        Field::Types::Which field_type;
        
        if (type_info.isNativeUInt())
        {
            nested_type = std::make_shared<DataTypeUInt64>();
            field_type = Field::Types::UInt64;
        }
        else if (type_info.isNativeInt())
        {
            nested_type = std::make_shared<DataTypeInt64>();
            field_type = Field::Types::Int64;
        }
        else if (type_info.isFloat64())
        {
            field_type = Field::Types::Float64;
        }