Tracking memory spill to external storage

[sundy-li]

Summary

Description for this feature.

Some queries with large memory allocation may cause OOM which is unstable.
After we have the memory tracker, we can spill extra memory into external storage(disk, s3). This will surely make the query run slower, but it ensures we can get the final results.

tasks to do

• spill memory in group by query (HashTable)
• spill memory in join query (HashTable)
• spill memory in order by query (multi-way external merge sort)

[zhang2014]

external storage(disk, s3)

Maybe use cache(automatically select s3 or disk) is better. CC: @Xuanwo

[Xuanwo]

We can spill to a temporary storages as described in https://databend.rs/doc/contributing/rfcs/cache