Disk-based DISTINCT

As of 22.08.01 MCS does DISTINCT processing TupleAnnexStep. This step leverages hashmap for the purpose. This solution is simple but it:

• lacks scalability
• can't leverage disk-based capabilities of RowStorage class used by GROUP BY
• ResourceManager that accounts RAM consumption doesn't counts the hashmap

This issue is about a new DISTINCT implementation(presumably based on RowStorage) that:

• can do external DISTINCT spilling on disk if necessary,
• ResourceManager counts the implemenation RAM consumption
• scales(this might be tricky since DISTINCT processing overlaps with ORDER BY)