New functionality to show compactions information for a specific table/partition of a given database

As per the current implementation, show compactions command will list compaction details of all the partitions and tables of all the databases in a single output.

If user happens to have 100 or 1000 or even more databases/tables/partitions, parsing the show compactions output to check details of specific table/partition will be difficult

So the proposal is to support something like

show compactions `db`.`table`[.`partition`]