ccmp_debug: columnar compression debug event

Usage
-------
ccmp_debug
   memcheck        <ub4>,
   dmlclose        <ub4>,
   lobupdates      <ub4>,
   diaglevel       <ub4>,
   projectonly     <ub4>,
   colcheck        <ub4>,
   minmaxcheck     <ub4>,
   debug_hpk       <ub4>,
   debug_ozip      <ub4>,
   subcu_pmethod   <ub4>,
   subcu_mmarr_ppct <ub4>,
   subcu_hist_ppct <ub4>,
   subcu_indenc_cpct <ub4>,
   subcu_loop      <ub4>,
   debug_pcode     <ub4>,
   imc_row_buffer_off <ub4>