Marcel Konopka

ClickHouseRowMetadata index should start at 0

2

### Describe the bug [ClickHouseRowMetadata](https://github.com/ClickHouse/clickhouse-java/blob/main/clickhouse-r2dbc/src/main/java/com/clickhouse/r2dbc/ClickHouseRowMetadata.java#L24) is starting the index at 1, but the index should be starting at 0, according to the [spec](https://github.com/r2dbc/r2dbc-spi/blob/main/r2dbc-spi/src/main/java/io/r2dbc/spi/RowMetadata.java#L33). ### Expected behaviour Should work according to...