WL#2617: Add support for "COMPRESS TABLE" call

Add support for compression for storage engines from Parser.

We will add the syntax of:

COMPRESS TABLE  

Where level will be:
NONE LOW MEDIUM HIGH

A new method will be added for handler.h in the same manner as optimize table.

Same sort of call as optimize table. This can be used by MyISAM and ARCHIVE to 
control compression ratios (though for MyISAM at the moment this means just one, 
so when MyISAM implements this all calls will compress).