Set unique name to longCompactions/shortCompactions threads

Sometime observed multiple compaction threads have the same name which is misleading while analysing the log.

Currently we just append the current timestamp which can be same for multiple threads,

https://github.com/apache/hbase/blob/ec68bf30ba91ea7484d3b56b0809ff5434f9406e/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplit.java#L144