Add query method returning enumerator over rows

[alespour]

Use Case

Other clients (C#, Go) provide simple way of iterating over query result rows, where row is represented as a map.

Expected behavior

There should be a query method returning something like Enumerable<Map<String,Object>>, Stream<...> or similar.

Actual behavior

There is only method returning Stream<org.apache.arrow.vector.VectorSchemaRoot>.

Additional info

No response