**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
catch (...)
        {
            exception = std::current_exception();
        }
        if (!format_settings.values.interpret_expressions)
        {
            if (exception)
                std::rethrow_exception(exception);
            else
            {
                buf.rollbackToCheckpoint();
                size_t len = const_cast<char *>(token_iterator->begin) - buf.position();
                throw Exception("Cannot deduce template of expression: " + std::string(buf.position(), len), ErrorCodes::SYNTAX_ERROR);
            }
        }
        
        templates[column_idx].reset();
    }
    if (!format_settings.values.interpret_expressions)
        throw Exception("Interpreting expressions is disabled", ErrorCodes::SUPPORT_IS_DISABLED);
    
    buf.position() = const_cast<char *>(token_iterator->begin);
    std::pair<Field, DataTypePtr> value_raw = evaluateConstantExpression(ast, *context);
    Field & expression_value = value_raw.first;
    if (format_settings.null_as_default)
        tryToReplaceNullFieldsInComplexTypesWithDefaultValues(expression_value, type);
    Field value = convertFieldToType(expression_value, type, value_raw.second.get());
    
    if (value.isNull() && !type.isNullable())
    {