Append does not honor Valuer interface for int32-backed enum.

Describe the bug

I'm using Gorm, and I have an enum backed by a int32. I'm trying to store it to a Nullable(Int32) by using a pointer to the enum value. When trying to store the row, I get the error attached below. I tried implementing driver.Valuer, and it didn't help.

From debugging a bit I notice that clickhouse-go uses the valuer to determine the nil-or-not-nil state, but not the actual value of the field.

Expected behaviour

The library should either automatically handle the conversion between the enum and the backing type, or at the very least it should use the driver.Valuer implementation properly to determine the value.

Code example

type MyEnum int32

// ...

func (m *MyEum) Value() (driver.Value, error) {
    converter := driver.Null{Converter: driver.Int32}
    if m == nil {
        return converter.ConvertValue(nil)
    }
    return converter.ConvertValue(int32(*m))
}

type MyEntity struct {
    Timestamp time.Time `gorm:"type:DateTime('UTC')"`
    MyEnumValue *MyEnum `gorm:"type:Nullable(Int32)"`
    // ...
}

Error log

clickhouse [AppendRow]: MyEnumValue clickhouse [AppendRow]: converting *example.MyEnum to Int32 is unsupported

Configuration

Environment

Client version: github.com/ClickHouse/clickhouse-go/v2 v2.8.2
Language version: go version go1.20.4 linux/amd64
OS: Linux d30d8d32178c 5.10.102.1-microsoft-standard-WSL2 #1 SMP Wed Mar 2 00:30:59 UTC 2022 x86_64 GNU/Linux
Interface: https://github.com/go-gorm/clickhouse

ClickHouse server

ClickHouse Server version: 22.3.12.21.altinitystable

CREATE TABLE statements for tables involved:

CREATE TABLE clickhouse.MyEntity (
`Timestamp` DateTime('UTC'),
MyEnumValue Nullable(Int32)
) ENGINE = MergeTree
PARTITION BY toYYYYMM(`Timestamp`)
PRIMARY KEY (`Timestamp`)
ORDER BY (`Timestamp`)
SETTINGS index_granularity = 8192;

ClickHouse / clickhouse-go