Add A New Compact Strategy For Pika

[MalikHou]

Add A New Compact Strategy For Pika

In AutoCompactRange function we use two strategies for compact. from issue OpenAtomFoundation#2255

Change

• Add Oldest Or Best Delete Ratio Sst compact strategy in redis.h/redis.cc;
• Build the compact function of db layer and storage layer;
• Use rules at the server layer to determine which compact strategy to execute

Need

• Test...