feat(bindings/nodejs): support queryIterMap

[everpcpc]

New method

let rows = await this.conn.queryIterMap("SELECT number as n FROM numbers(5)");
let ret = [];
let row = await rows.next();
while (row) {
  ret.push(row.data());
  row = await rows.next();
}

will get Key-Value Pair Rows.

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• for: Support for Key-Value Pair Query Results, Streamed Data Access #507