**Describe the unexpected behaviour**
ClickHouse returns exception if you would try to read polygon dictionary via SELECT query.

**How to reproduce**
ClickHouse version 21.10


```
CREATE DICTIONARY polygon_dict (
    key Array(Array(Array(Array(Float64)))),
    name String,
    value UInt64
)
PRIMARY KEY key
LAYOUT(POLYGON())
SOURCE(CLICKHOUSE(table 'polygon_dict_src'))
LIFETIME(MIN 300 MAX 360);

CREATE TABLE polygon_dict_src
(
    `key` Array(Array(Array(Array(Float64)))),
    `name` String,
    `value` UInt64
)
ENGINE = Log
	
INSERT INTO polygon_dict_src SELECT [[[[1.1,2.1],[5,3],[6,4],[1,4]]]], 'some', 10;


CREATE DICTIONARY polygon_dict (
    key Array(Array(Array(Array(Float64)))),
    name String,
    value UInt64
)
PRIMARY KEY key
LAYOUT(POLYGON())
SOURCE(CLICKHOUSE(table 'polygon_dict_src'))
LIFETIME(MIN 300 MAX 360);

SELECT dictGet(polygon_dict, 'name', (2., 3.)) AS x

┌─x────┐
│ some │
└──────┘

SELECT *
FROM polygon_dict

0 rows in set. Elapsed: 0.008 sec.

Received exception from server (version 21.10.1):
Code: 1. DB::Exception: Received from localhost:9000. DB::Exception: Reading the dictionary is not allowed. (UNSUPPORTED_METHOD)
```


**Expected behavior**
It's allowed to read POLYGON dictionaries via SELECT query.

const auto simple_polygon_array = DataTypeArray(std::make_shared<DataTypeArray>(f64));
    const auto simple_polygon_tuple = DataTypeArray(std::make_shared<DataTypeTuple>(std::vector<DataTypePtr>{f64, f64}));
    if (key_type->equals(multi_polygon_array))
    {
        input_type = IPolygonDictionary::InputType::MultiPolygon;
        point_type = IPolygonDictionary::PointType::Array;
    }
    else if (key_type->equals(multi_polygon_tuple))
    {
        input_type = IPolygonDictionary::InputType::MultiPolygon;
        point_type = IPolygonDictionary::PointType::Tuple;
    }
    else if (key_type->equals(simple_polygon_array))
    {
        input_type = IPolygonDictionary::InputType::SimplePolygon;
        point_type = IPolygonDictionary::PointType::Array;
    }
    else if (key_type->equals(simple_polygon_tuple))
    {
        input_type = IPolygonDictionary::InputType::SimplePolygon;
        point_type = IPolygonDictionary::PointType::Tuple;
    }
    else
        throw Exception(ErrorCodes::BAD_ARGUMENTS,
            "The key type {} is not one of the following allowed types for a polygon dictionary: {} {} {} {} ",
            key_type->getName(),
            multi_polygon_array.getName(),
            multi_polygon_tuple.getName(),
            simple_polygon_array.getName(),
            simple_polygon_tuple.getName());