Summary:
Using the Sequence number to time mapping to decide if a key is hot or not in
compaction and place it in the corresponding level.

Note: the feature is not complete, level compaction will run indefinitely until
all penultimate level data is cold and small enough to not trigger compaction.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10370

Test Plan:
CI
* Run basic db_bench for universal compaction manually

Reviewed By: siying

Differential Revision: D37892338

Pulled By: jay-zhuang

fbshipit-source-id: 792bbd91b1ccc2f62b5d14c53118434bcaac4bbe